{"id":40035,"date":"2023-11-20T14:30:45","date_gmt":"2023-11-20T06:30:45","guid":{"rendered":"https:\/\/autoolstore.com\/?post_type=product&#038;p=40035"},"modified":"2026-09-20T08:31:39","modified_gmt":"2026-09-20T16:31:39","slug":"autool-as502-car-brake-fluid-tester","status":"publish","type":"product","link":"https:\/\/autoolstore.com\/product\/autool-as502-car-brake-fluid-tester\/","title":{"rendered":"AUTOOL AS502 Brake Fluid Water-Content Tester"},"content":{"rendered":"\n\n\r\n<div class=\"autool-page-shell\"><main class=\"autool-description autool-product-page\" data-autool-lightbox=\"off\" data-autool-mobile-nav=\"false\" data-autool-rail-controls=\"true\" id=\"as502-product-page\"><section class=\"autool-section autool-product-hero autool-section--overview\" data-autool-nav=\"Overview\" data-autool-surface=\"dark\" id=\"autool-overview\"><div class=\"autool-layout-container autool-product-hero__grid\">\r\n<div class=\"autool-product-hero__copy\">\r\n<p class=\"autool-product-hero__eyebrow\">AUTOOL AS502 \u00b7 Brake Fluid Water-Content Tester<\/p>\r\n<h2 class=\"autool-product-hero__title\">Match the Fluid Mode Before Screening Moisture<\/h2>\r\n<p class=\"autool-product-hero__lead\">Screen water content in supported DOT3, DOT4, and DOT5.1 brake fluids after matching the fluid mode. AS502 offers a standard test path plus Expert references for supported DOT4 brands, while the flexible reservoir probe and backlit display keep sampling and status review together. Use the result with the vehicle\u2019s service criteria.<\/p>\r\n<ul aria-label=\"AS502 key benefits\" class=\"autool-product-hero__capabilities\">\r\n<li>DOT 3 \/ 4 \/ 5.1 Modes<\/li>\r\n<li>Standard And Expert Paths<\/li>\r\n<li>260 mm Flexible Probe<\/li>\r\n<li>2.8-Inch Backlit Display<\/li>\r\n<li>4 \u00d7 AAA Battery Power<\/li>\r\n<\/ul>\r\n<nav aria-label=\"AS502 sections\" class=\"autool-product-hero__actions\"><a class=\"autool-product-button autool-product-button--primary\" href=\"#autool-features\">Explore Features<\/a><a class=\"autool-product-button\" href=\"#autool-use\">View Workflow<\/a><a class=\"autool-product-button\" href=\"#autool-comparison\">Specs &amp; Compare<\/a><\/nav>\r\n<\/div>\r\n<figure class=\"autool-product-hero__media\"><img alt=\"AUTOOL AS502 brake fluid tester main product image showing pressure boost detection probe compatibility handheld design and backlit display\" decoding=\"async\" fetchpriority=\"high\" loading=\"eager\" src=\"https:\/\/autoolstore.com\/wp-content\/uploads\/2023\/11\/AUTOOL-AS502-Car-Brake-Fluid-Tester-For-Water-Content-Testing-2.png\"\/><\/figure>\r\n<\/div><\/section><aside aria-label=\"AS502 at a glance\" class=\"autool-product-metrics\"><div class=\"autool-product-metrics__inner\">\n<div class=\"autool-product-metric\"><strong>260 mm<\/strong><span>Flexible Probe<\/span><\/div>\n<div class=\"autool-product-metric\"><strong>10s<\/strong><span>Response Time<\/span><\/div>\n<div class=\"autool-product-metric\"><strong>2.8 in<\/strong><span>Backlit LCD<\/span><\/div>\n<div class=\"autool-product-metric\"><strong>4 \u00d7 AAA<\/strong><span>Battery Power<\/span><\/div>\n<\/div><\/aside><section class=\"autool-section autool-product-section--soft autool-section--value\" data-autool-surface=\"base\" id=\"autool-features\"><div class=\"autool-layout-container\">\r\n<header class=\"autool-section-head\"><p class=\"autool-subhead\">Key Features<\/p>\r\n<h2 class=\"autool-title\">Normal and Expert Brake Fluid Modes<\/h2><\/header><div class=\"autool-product-grid autool-product-grid--3 autool-product-rail\" data-autool-rail=\"features\">\r\n<article class=\"autool-product-card\"><h3>Water-Content Screening<\/h3>\r\n<p>The flexible reservoir probe screens brake-fluid water content in the selected supported mode. It does not generate or measure hydraulic brake pressure.<\/p><\/article><article class=\"autool-product-card\"><h3>Multiple Brake Fluid Support<\/h3>\r\n<p>Normal mode supports DOT3, DOT4, and DOT5.1 brake fluid, making AS502 suitable for common vehicle brake fluid checks.<\/p><\/article><article class=\"autool-product-card\"><h3>Normal And Expert Modes<\/h3>\r\n<p>Switch between standard brake-fluid type testing and expert mode for selected DOT4 brands when more targeted fluid selection is needed.<\/p><\/article><article class=\"autool-product-card\"><h3>260mm Flexible Probe<\/h3>\r\n<p>The 260mm gooseneck probe helps reach the brake fluid reservoir more easily during vehicle maintenance.<\/p><\/article><article class=\"autool-product-card\"><h3>304 Stainless Steel Outer Hose<\/h3>\r\n<p>The probe hose outer layer uses 304 stainless steel for oil resistance, oxidation resistance, and corrosion resistance.<\/p><\/article><article class=\"autool-product-card\"><h3>2.8-inch Backlit Display<\/h3>\r\n<p>The 2.8-inch LCD backlit display makes the result easier to read in bright or low-light working conditions.<\/p><\/article><article class=\"autool-product-card\"><h3>Single-Handed Control<\/h3>\r\n<p>The silicone grip and handheld control layout support single-handed brake fluid testing.<\/p><\/article><article class=\"autool-product-card\"><h3>AAA Battery Power<\/h3>\r\n<p>The tester uses 6V power from 4 \u00d7 1.5V AAA batteries. Install batteries with the correct polarity before operation.<\/p><\/article><article class=\"autool-product-card\"><h3>Water Content And Status<\/h3>\r\n<p>The screen displays brake fluid water content together with OK, warning and suggested replacement indicators.<\/p><\/article><article class=\"autool-product-card\"><h3>5-Minute Auto Power-Off<\/h3><p>The tester automatically powers off after 5 minutes without operation to conserve battery power.<\/p><\/article><article class=\"autool-product-card\"><h3>3 Years Warranty Support<\/h3><p>Main unit: 3-year warranty. Standard accessories: 1-year warranty. <a href=\"https:\/\/autoolstore.com\/warranty-policy\/\" rel=\"noopener\" target=\"_blank\">Warranty Policy<\/a>.<\/p><\/article><\/div>\r\n<\/div><\/section><section class=\"autool-section autool-section--workflow autool-section--workflow-anchor\" data-autool-surface=\"dark\" id=\"autool-use\"><div class=\"autool-layout-container\">\r\n<header class=\"autool-section-head\"><p class=\"autool-subhead\">Service Workflow<\/p>\r\n<h2 class=\"autool-title\">Select, Immerse, Read and Clean<\/h2><\/header><div class=\"autool-workflow\" data-autool-workflow=\"\" data-workflow-mode=\"panels\">\r\n<div aria-label=\"as502 workflow\" class=\"autool-workflow__tabs\" data-workflow-tabs=\"\" role=\"tablist\">\r\n<button aria-controls=\"as502-panel-0\" aria-selected=\"true\" class=\"autool-workflow__tab\" data-workflow-step=\"0\" id=\"as502-tab-0\" role=\"tab\" tabindex=\"0\" type=\"button\">01<br\/><wbr\/>Install<wbr\/> Batteries<\/button><button aria-controls=\"as502-panel-1\" aria-selected=\"false\" class=\"autool-workflow__tab\" data-workflow-step=\"1\" id=\"as502-tab-1\" role=\"tab\" tabindex=\"-1\" type=\"button\">02<br\/><wbr\/>Power<wbr\/> On<\/button><button aria-controls=\"as502-panel-2\" aria-selected=\"false\" class=\"autool-workflow__tab\" data-workflow-step=\"2\" id=\"as502-tab-2\" role=\"tab\" tabindex=\"-1\" type=\"button\">03<br\/><wbr\/>Clean<wbr\/> The<wbr\/> Probe<\/button><button aria-controls=\"as502-panel-3\" aria-selected=\"false\" class=\"autool-workflow__tab\" data-workflow-step=\"3\" id=\"as502-tab-3\" role=\"tab\" tabindex=\"-1\" type=\"button\">04<br\/><wbr\/>Open<wbr\/> The<wbr\/> Reservoir<\/button><button aria-controls=\"as502-panel-4\" aria-selected=\"false\" class=\"autool-workflow__tab\" data-workflow-step=\"4\" id=\"as502-tab-4\" role=\"tab\" tabindex=\"-1\" type=\"button\">05<br\/><wbr\/>Select<wbr\/> Fluid<wbr\/> Type<\/button><button aria-controls=\"as502-panel-5\" aria-selected=\"false\" class=\"autool-workflow__tab\" data-workflow-step=\"5\" id=\"as502-tab-5\" role=\"tab\" tabindex=\"-1\" type=\"button\">06<br\/><wbr\/>Immerse<wbr\/> And<wbr\/> Test<\/button><button aria-controls=\"as502-panel-6\" aria-selected=\"false\" class=\"autool-workflow__tab\" data-workflow-step=\"6\" id=\"as502-tab-6\" role=\"tab\" tabindex=\"-1\" type=\"button\">07<br\/><wbr\/>Guided<wbr\/> Fluid<wbr\/> Check<\/button>\r\n<\/div>\r\n<div class=\"autool-workflow__position\">\r\n<span class=\"autool-workflow__position-label\">Step progress<\/span><span class=\"autool-workflow__progress\"><span class=\"autool-workflow__progress-bar\" data-workflow-progress=\"\"><\/span><\/span><span class=\"autool-workflow__position-count\" data-workflow-count=\"\">1 \/ 7<\/span>\r\n<\/div>\r\n<div class=\"autool-workflow__content\">\r\n<div class=\"autool-workflow__main\">\r\n<div class=\"autool-workflow__panels\">\r\n<article aria-labelledby=\"as502-tab-0\" class=\"autool-workflow__panel\" data-workflow-panel=\"\" id=\"as502-panel-0\" role=\"tabpanel\" tabindex=\"0\"><div class=\"autool-workflow__number\">01<\/div>\r\n<h3 class=\"autool-workflow__title\">Install Batteries<\/h3>\r\n<p class=\"autool-workflow__description\">Open the rear battery cover, insert 4 \u00d7 1.5V AAA batteries with correct polarity, then close the cover securely.<\/p><\/article><article aria-labelledby=\"as502-tab-1\" class=\"autool-workflow__panel\" data-workflow-panel=\"\" hidden=\"\" id=\"as502-panel-1\" role=\"tabpanel\" tabindex=\"0\"><div class=\"autool-workflow__number\">02<\/div>\r\n<h3 class=\"autool-workflow__title\">Power On<\/h3>\r\n<p class=\"autool-workflow__description\">Long press the power button for more than 2 seconds to turn on the tester.<\/p><\/article><article aria-labelledby=\"as502-tab-2\" class=\"autool-workflow__panel\" data-workflow-panel=\"\" hidden=\"\" id=\"as502-panel-2\" role=\"tabpanel\" tabindex=\"0\"><div class=\"autool-workflow__number\">03<\/div>\r\n<h3 class=\"autool-workflow__title\">Clean The Probe<\/h3>\r\n<p class=\"autool-workflow__description\">Wipe the probe clean before each measurement to avoid residue affecting the result.<\/p><\/article><article aria-labelledby=\"as502-tab-3\" class=\"autool-workflow__panel\" data-workflow-panel=\"\" hidden=\"\" id=\"as502-panel-3\" role=\"tabpanel\" tabindex=\"0\"><div class=\"autool-workflow__number\">04<\/div>\r\n<h3 class=\"autool-workflow__title\">Open The Reservoir<\/h3>\r\n<p class=\"autool-workflow__description\">Open the brake fluid reservoir cap and prepare the brake fluid sample area for testing.<\/p><\/article><article aria-labelledby=\"as502-tab-4\" class=\"autool-workflow__panel\" data-workflow-panel=\"\" hidden=\"\" id=\"as502-panel-4\" role=\"tabpanel\" tabindex=\"0\"><div class=\"autool-workflow__number\">05<\/div>\r\n<h3 class=\"autool-workflow__title\">Select Fluid Type<\/h3>\r\n<p class=\"autool-workflow__description\">Press the selection button to choose DOT3, DOT4, DOT5.1, or an available expert-mode DOT4 brand.<\/p><\/article><article aria-labelledby=\"as502-tab-5\" class=\"autool-workflow__panel\" data-workflow-panel=\"\" hidden=\"\" id=\"as502-panel-5\" role=\"tabpanel\" tabindex=\"0\"><div class=\"autool-workflow__number\">06<\/div>\r\n<h3 class=\"autool-workflow__title\">Immerse And Test<\/h3>\r\n<p class=\"autool-workflow__description\">Submerge the probe into the brake fluid, press the test button, and read the displayed water content percentage and status indicator.<\/p><\/article><article aria-labelledby=\"as502-tab-6\" class=\"autool-workflow__panel\" data-workflow-panel=\"\" hidden=\"\" id=\"as502-panel-6\" role=\"tabpanel\" tabindex=\"0\"><div class=\"autool-workflow__number\">07<\/div>\r\n<h3 class=\"autool-workflow__title\">Guided Fluid Check<\/h3>\r\n<p class=\"autool-workflow__description\">Clean the probe, select the correct brake fluid type, immerse the probe and start the test. Read the water content percentage and status on the screen.<\/p><\/article>\r\n<\/div>\r\n<div class=\"autool-workflow__actions\">\r\n<button class=\"autool-workflow__button\" data-workflow-prev=\"\" disabled=\"\" type=\"button\">\u2190 Previous<\/button><button class=\"autool-workflow__button autool-workflow__button--next\" data-workflow-next=\"\" type=\"button\">Next step \u2192<\/button>\r\n<\/div>\r\n<\/div>\r\n<aside class=\"autool-workflow__safety\" data-workflow-safety=\"\"><h3 class=\"autool-workflow__safety-title\">Before You Start<\/h3>\r\n<ul class=\"autool-workflow__safety-list\">\r\n<li>AS502 is designed to test the water content percentage in brake fluid. It is not an engine oil, transmission fluid, or power steering fluid tester.<\/li>\r\n<li>Use AS502 with supported brake fluid types. Normal mode is for DOT3, DOT4, and DOT5.1 brake fluid; expert mode is for selected DOT4 brands.<\/li>\r\n<\/ul><\/aside>\r\n<\/div>\r\n<\/div>\r\n<\/div><\/section><section class=\"autool-section autool-product-section--soft\" data-autool-surface=\"base\" id=\"autool-safety\"><div class=\"autool-layout-container\">\r\n<header class=\"autool-section-head\"><p class=\"autool-subhead\">Safe Use<\/p>\r\n<h2 class=\"autool-title\">Separate Fluid Fit from Service Verdict<\/h2><\/header><div class=\"autool-product-grid autool-product-grid--3 autool-product-rail\" data-autool-rail=\"safety\">\r\n<article class=\"autool-product-card\"><h3>Brake Fluid Water Test<\/h3>\r\n<p>AS502 is designed to test the water content percentage in brake fluid. It is not an engine oil, transmission fluid, or power steering fluid tester.<\/p><\/article><article class=\"autool-product-card\"><h3>Use Supported Fluids Only<\/h3>\r\n<p>Use AS502 with supported brake fluid types. Normal mode is for DOT3, DOT4, and DOT5.1 brake fluid; expert mode is for selected DOT4 brands.<\/p><\/article><article class=\"autool-product-card\"><h3>Install 4 AAA Batteries<\/h3>\r\n<p>The tester uses 6V power from 4 \u00d7 1.5V AAA batteries. Install batteries with the correct polarity before operation.<\/p><\/article><article class=\"autool-product-card\"><h3>Routine Check Suggestion<\/h3>\r\n<p>For routine maintenance, checking brake fluid around every 40,000 km is recommended, depending on vehicle condition and service requirements.<\/p><\/article><article class=\"autool-product-card\"><h3>Clean The Probe<\/h3>\r\n<p>Wipe the probe clean before each measurement and clean it after use to avoid fluid residue affecting later tests.<\/p><\/article><article class=\"autool-product-card\"><h3>Store Dry<\/h3>\r\n<p>If the tester will not be used for a long time, remove all batteries and store the unit in a dry place at normal room temperature.<\/p><\/article><article class=\"autool-product-card\"><h3>Use the Moisture Screening Result<\/h3>\r\n<p>Select the exact brake-fluid mode, clean the probe between samples and use the displayed moisture\/grade value for quick fluid screening. It is not a standardized wet boiling-point result.<\/p><\/article>\r\n<\/div>\r\n<\/div><\/section><section class=\"autool-section autool-comparison\" data-autool-nav=\"Spec&amp;Comparison\" data-autool-surface=\"dark\" id=\"autool-comparison\"><div class=\"autool-layout-container\">\r\n<header class=\"autool-section-head\"><p class=\"autool-subhead\">Model Comparison<\/p>\r\n<h2 class=\"autool-title\">Choose the Right Fluid Test Method<\/h2><\/header><div class=\"autool-model-compare\" data-autool-model-compare=\"\" data-current-model=\"as502\">\r\n<button aria-controls=\"compare-source-10-compare-model-picker\" aria-expanded=\"false\" aria-label=\"Open model comparison selector\" class=\"autool-model-compare__mobile-trigger\" data-compare-picker-open=\"\" type=\"button\"><span class=\"autool-model-compare__mobile-trigger-copy\"><strong>Compare models<\/strong><span data-compare-mobile-summary=\"\">Selected: AS502<\/span><\/span><span class=\"autool-model-compare__mobile-trigger-count\" data-compare-mobile-count=\"\">1<\/span><\/button>\r\n<button aria-label=\"Close model selector\" class=\"autool-model-compare__scrim\" data-compare-picker-close=\"\" tabindex=\"-1\" type=\"button\"><\/button>\r\n<div aria-labelledby=\"compare-source-10-compare-picker-title\" class=\"autool-model-compare__selector\" id=\"compare-source-10-compare-model-picker\" role=\"group\">\r\n<div class=\"autool-model-compare__selector-head\">\r\n<div class=\"autool-model-compare__selector-copy\">\r\n<h3 class=\"autool-model-compare__legend\" id=\"compare-source-10-compare-picker-title\">Model Guide<\/h3>\r\n<p class=\"autool-model-compare__instruction\">Choose one or more models. AS502 is selected by default.<\/p>\r\n<\/div>\r\n<div class=\"autool-model-compare__selector-tools\">\r\n<div class=\"autool-model-compare__count\" data-compare-count=\"\">1 model selected<\/div>\r\n<button aria-label=\"Close model selector\" class=\"autool-model-compare__picker-close\" data-compare-picker-close=\"\" type=\"button\">\u00d7<\/button>\r\n<\/div>\r\n<\/div>\r\n<div aria-label=\"Models available for comparison\" class=\"autool-model-compare__grid\" role=\"list\">\r\n<label class=\"autool-model-option\" data-model-card=\"as501\" role=\"listitem\"><input data-model-checkbox=\"\" type=\"checkbox\" value=\"as501\"\/><span class=\"autool-model-option__copy\"><strong class=\"autool-model-option__model\">AS501 Brake Fluid Tester<\/strong><span class=\"autool-model-option__tier\">Brake-fluid moisture \/ 1.8-inch \/ 6 modes<\/span><\/span><\/label><label class=\"autool-model-option autool-is-selected\" data-model-card=\"as502\" role=\"listitem\"><input checked=\"\" data-model-checkbox=\"\" type=\"checkbox\" value=\"as502\"\/><span class=\"autool-model-option__copy\"><strong class=\"autool-model-option__model\">AS502 Brake Fluid Tester<\/strong><span class=\"autool-model-option__tier\">Brake-fluid moisture \/ 2.8-inch \/ Expert mode<\/span><\/span><span class=\"autool-model-option__current\">Current model<\/span><\/label><label class=\"autool-model-option\" data-model-card=\"as503\" role=\"listitem\"><input data-model-checkbox=\"\" type=\"checkbox\" value=\"as503\"\/><span class=\"autool-model-option__copy\"><strong class=\"autool-model-option__model\">AS503 Engine Oil Quality Tester<\/strong><span class=\"autool-model-option__tier\">Engine-oil transmittance \/ 0\u201385 \u00b0C \/ 80 cm probe<\/span><\/span><\/label><label class=\"autool-model-option\" data-model-card=\"as505\" role=\"listitem\"><input data-model-checkbox=\"\" type=\"checkbox\" value=\"as505\"\/><span class=\"autool-model-option__copy\"><strong class=\"autool-model-option__model\">AS505 Transmission Fluid Tester<\/strong><span class=\"autool-model-option__tier\">ATF transmittance \/ 0\u201385 \u00b0C \/ 80 cm probe<\/span><\/span><\/label><label class=\"autool-model-option\" data-model-card=\"as506\" role=\"listitem\"><input data-model-checkbox=\"\" type=\"checkbox\" value=\"as506\"\/><span class=\"autool-model-option__copy\"><strong class=\"autool-model-option__model\">AS506 Brake Fluid Boiling Point Tester<\/strong><span class=\"autool-model-option__tier\">Brake-fluid boiling point \/ 0\u2013320 \u00b0C \/ 16 s<\/span><\/span><\/label><label class=\"autool-model-option\" data-model-card=\"as507\" role=\"listitem\"><input data-model-checkbox=\"\" type=\"checkbox\" value=\"as507\"\/><span class=\"autool-model-option__copy\"><strong class=\"autool-model-option__model\">AS507 Power Steering Fluid Tester<\/strong><span class=\"autool-model-option__tier\">Steering-fluid transmittance \/ 0\u201385 \u00b0C \/ 80 cm test cable<\/span><\/span><\/label><label class=\"autool-model-option\" data-model-card=\"as509\" role=\"listitem\"><input data-model-checkbox=\"\" type=\"checkbox\" value=\"as509\"\/><span class=\"autool-model-option__copy\"><strong class=\"autool-model-option__model\">AS509 Coolant Boiling Point Tester<\/strong><span class=\"autool-model-option__tier\">Coolant boiling point \/ 23 brands \/ 20\u201340 s<\/span><\/span><\/label>\r\n<\/div>\r\n<div class=\"autool-model-compare__selection-bar\">\r\n<p aria-live=\"polite\" class=\"autool-model-compare__status\" data-compare-status=\"\" id=\"compare-source-10-compare-result-status\" role=\"status\">AUTOOL AS502 Brake Fluid Tester is selected. Choose another model for a side-by-side comparison.<\/p>\r\n<div class=\"autool-model-compare__selection-actions\">\r\n<button class=\"autool-model-compare__clear\" data-compare-clear=\"\" disabled=\"\" type=\"button\">Reset selection<\/button><button class=\"autool-model-compare__done\" data-compare-picker-close=\"\" type=\"button\">Done<\/button>\r\n<\/div>\r\n<\/div>\r\n<\/div>\r\n<div class=\"autool-model-compare__result\" data-compare-result=\"\">\r\n<div class=\"autool-model-compare__result-toolbar\">\r\n<h3 class=\"autool-model-compare__result-title\" data-compare-title=\"\" id=\"compare-source-10-compare-result-title\">AS502 comparison<\/h3>\r\n<label aria-disabled=\"true\" class=\"autool-model-compare__difference-toggle\" data-differences-label=\"\"><input data-differences-only=\"\" disabled=\"\" type=\"checkbox\"\/> Show differences only<\/label>\r\n<\/div>\r\n<div data-compare-table=\"\">\r\n<div class=\"autool-compare-matrix__empty\" hidden=\"\">No model is selected. Choose a model to compare.<\/div>\r\n<div aria-describedby=\"compare-source-10-compare-result-status\" aria-labelledby=\"compare-source-10-compare-result-title\" class=\"autool-compare-matrix-wrap\" role=\"region\" tabindex=\"0\">\r\n<table class=\"autool-compare-matrix\" data-autool-columns=\"1\">\r\n<caption class=\"autool-visually-hidden autool-table-caption--accessible\">Comparison of AUTOOL Automotive Oil &amp; Fluid Analyzers<\/caption>\r\n<colgroup>\r\n<col class=\"autool-compare-matrix__criteria-col\"\/>\r\n<col class=\"autool-compare-matrix__model-col\" data-compare-model=\"as501\" hidden=\"\"\/>\r\n<col class=\"autool-compare-matrix__model-col\" data-compare-model=\"as502\"\/>\r\n<col class=\"autool-compare-matrix__model-col\" data-compare-model=\"as503\" hidden=\"\"\/>\r\n<col class=\"autool-compare-matrix__model-col\" data-compare-model=\"as505\" hidden=\"\"\/>\r\n<col class=\"autool-compare-matrix__model-col\" data-compare-model=\"as506\" hidden=\"\"\/>\r\n<col class=\"autool-compare-matrix__model-col\" data-compare-model=\"as507\" hidden=\"\"\/>\r\n<col class=\"autool-compare-matrix__model-col\" data-compare-model=\"as509\" hidden=\"\"\/>\r\n<\/colgroup>\r\n<thead><tr>\r\n<th scope=\"col\">Product name<\/th>\r\n<th data-compare-model=\"as501\" hidden=\"\" scope=\"col\">AS501 Brake Fluid Tester<\/th>\r\n<th data-compare-model=\"as502\" scope=\"col\">AS502 Brake Fluid Tester<\/th>\r\n<th data-compare-model=\"as503\" hidden=\"\" scope=\"col\">AS503 Engine Oil Quality Tester<\/th>\r\n<th data-compare-model=\"as505\" hidden=\"\" scope=\"col\">AS505 Transmission Fluid Tester<\/th>\r\n<th data-compare-model=\"as506\" hidden=\"\" scope=\"col\">AS506 Brake Fluid Boiling Point Tester<\/th>\r\n<th data-compare-model=\"as507\" hidden=\"\" scope=\"col\">AS507 Power Steering Fluid Tester<\/th>\r\n<th data-compare-model=\"as509\" hidden=\"\" scope=\"col\">AS509 Coolant Boiling Point Tester<\/th>\r\n<\/tr><\/thead>\r\n<tbody><tr class=\"autool-compare-matrix__category\" data-compare-category=\"layout-group-1\">\r\n<th class=\"autool-compare-matrix__category-label\" scope=\"rowgroup\"><span class=\"autool-compare-matrix__category-label-inner\">Test Method &amp; Application<\/span><\/th>\r\n<td class=\"autool-compare-matrix__category-track\" colspan=\"1\" data-compare-category-track=\"\"><span aria-hidden=\"true\" class=\"autool-compare-matrix__category-progress\" data-autool-progress-order-ready=\"yes\" data-compare-category-progress=\"\"><span class=\"autool-compare-matrix__category-progress-label\">Slide \/ drag<\/span><span class=\"autool-compare-matrix__category-progress-meter\"><span class=\"autool-compare-matrix__category-progress-bar\"><\/span><\/span><span class=\"autool-compare-matrix__category-progress-count\" data-compare-category-count=\"\">1 \/ 1<\/span><\/span><\/td>\r\n<\/tr><tr data-compare-group=\"layout-group-1\" data-compare-row=\"\">\r\n<th class=\"autool-compare-matrix__feature\" scope=\"row\">Detection Technology<\/th>\r\n<td data-compare-model=\"as501\" hidden=\"\"><div class=\"autool-compare-matrix__value\">Pressure Boost Detection Technology<\/div><\/td>\r\n<td data-compare-model=\"as502\"><div class=\"autool-compare-matrix__value\">Water-content screening; no hydraulic pressure generation or measurement<\/div><\/td>\r\n<td data-compare-model=\"as503\" hidden=\"\"><div class=\"autool-compare-matrix__value\">Optical Probe Technology<\/div><\/td>\r\n<td data-compare-model=\"as505\" hidden=\"\"><div class=\"autool-compare-matrix__value\">Optical Probe Technology<\/div><\/td>\r\n<td data-compare-model=\"as506\" hidden=\"\"><div class=\"autool-compare-matrix__value\">Sample Heating Technology<\/div><\/td>\r\n<td data-compare-model=\"as507\" hidden=\"\"><div class=\"autool-compare-matrix__value\">Optical Probe Technology<\/div><\/td>\r\n<td data-compare-model=\"as509\" hidden=\"\"><div class=\"autool-compare-matrix__value\">Sample Heating Technology<\/div><\/td>\r\n<\/tr><tr data-compare-group=\"layout-group-1\" data-compare-row=\"\">\r\n<th class=\"autool-compare-matrix__feature\" scope=\"row\">Operating Principle<\/th>\r\n<td data-compare-model=\"as501\" hidden=\"\"><div class=\"autool-compare-matrix__value\">Brake Fluid (Water Content)<\/div><\/td>\r\n<td data-compare-model=\"as502\"><div class=\"autool-compare-matrix__value\">Brake Fluid (Water Content)<\/div><\/td>\r\n<td data-compare-model=\"as503\" hidden=\"\"><div class=\"autool-compare-matrix__value\">Engine Oil (Transmittance)<\/div><\/td>\r\n<td data-compare-model=\"as505\" hidden=\"\"><div class=\"autool-compare-matrix__value\">Transmission Fluid(Transmittance)<\/div><\/td>\r\n<td data-compare-model=\"as506\" hidden=\"\"><div class=\"autool-compare-matrix__value\">Brake Fluid (Boiling Point)<\/div><\/td>\r\n<td data-compare-model=\"as507\" hidden=\"\"><div class=\"autool-compare-matrix__value\">Steering Fluid (Transmittance)<\/div><\/td>\r\n<td data-compare-model=\"as509\" hidden=\"\"><div class=\"autool-compare-matrix__value\">Coolant<\/div><\/td>\r\n<\/tr><tr data-compare-group=\"layout-group-1\" data-compare-row=\"\">\r\n<th class=\"autool-compare-matrix__feature\" scope=\"row\">Test Mode Selection<\/th>\r\n<td data-compare-model=\"as501\" hidden=\"\"><div class=\"autool-compare-matrix__value\">Normal Mode<\/div><\/td>\r\n<td data-compare-model=\"as502\"><div class=\"autool-compare-matrix__value\">Normal Mode\/Expert Mode<\/div><\/td>\r\n<td data-compare-model=\"as503\" hidden=\"\"><div class=\"autool-compare-matrix__value\">Gasoline Engine\/Diesel Engine<\/div><\/td>\r\n<td data-compare-model=\"as505\" hidden=\"\"><div class=\"autool-compare-matrix__value\">Automotive Transmission Fluid<\/div><\/td>\r\n<td data-compare-model=\"as506\" hidden=\"\"><div class=\"autool-compare-matrix__value\">Normal Mode\/Brand Mode<\/div><\/td>\r\n<td data-compare-model=\"as507\" hidden=\"\"><div class=\"autool-compare-matrix__value\">Automotive Steering Gear<\/div><\/td>\r\n<td data-compare-model=\"as509\" hidden=\"\"><div class=\"autool-compare-matrix__value\">Normal Mode\/Brand Mode<\/div><\/td>\r\n<\/tr><tr data-compare-group=\"layout-group-1\" data-compare-row=\"\">\r\n<th class=\"autool-compare-matrix__feature\" scope=\"row\">Boiling Point Reference Value<\/th>\r\n<td data-compare-model=\"as501\" hidden=\"\"><div class=\"autool-compare-matrix__value\"><span aria-label=\"No\" class=\"autool-compare-matrix__mark\" data-autool-state=\"no\" data-layout43-marker=\"\" role=\"img\">\u00d7<\/span><\/div><\/td>\r\n<td data-compare-model=\"as502\"><div class=\"autool-compare-matrix__value\"><span aria-label=\"No\" class=\"autool-compare-matrix__mark\" data-autool-state=\"no\" data-layout43-marker=\"\" role=\"img\">\u00d7<\/span><\/div><\/td>\r\n<td data-compare-model=\"as503\" hidden=\"\"><div class=\"autool-compare-matrix__value\"><span aria-label=\"No\" class=\"autool-compare-matrix__mark\" data-autool-state=\"no\" data-layout43-marker=\"\" role=\"img\">\u00d7<\/span><\/div><\/td>\r\n<td data-compare-model=\"as505\" hidden=\"\"><div class=\"autool-compare-matrix__value\"><span aria-label=\"No\" class=\"autool-compare-matrix__mark\" data-autool-state=\"no\" data-layout43-marker=\"\" role=\"img\">\u00d7<\/span><\/div><\/td>\r\n<td data-compare-model=\"as506\" hidden=\"\"><div class=\"autool-compare-matrix__value\"><span aria-label=\"Yes\" class=\"autool-compare-matrix__mark\" data-autool-state=\"yes\" data-layout43-marker=\"\" role=\"img\">\u2713<\/span><\/div><\/td>\r\n<td data-compare-model=\"as507\" hidden=\"\"><div class=\"autool-compare-matrix__value\"><span aria-label=\"No\" class=\"autool-compare-matrix__mark\" data-autool-state=\"no\" data-layout43-marker=\"\" role=\"img\">\u00d7<\/span><\/div><\/td>\r\n<td data-compare-model=\"as509\" hidden=\"\"><div class=\"autool-compare-matrix__value\"><span aria-label=\"Yes\" class=\"autool-compare-matrix__mark\" data-autool-state=\"yes\" data-layout43-marker=\"\" role=\"img\">\u2713<\/span><\/div><\/td>\r\n<\/tr><tr data-compare-group=\"layout-group-1\" data-compare-row=\"\">\r\n<th class=\"autool-compare-matrix__feature\" scope=\"row\">Normal Mode<\/th>\r\n<td data-compare-model=\"as501\" hidden=\"\"><div class=\"autool-compare-matrix__value\">6 Types<br\/>ENV-4\u3001ENV-6<br\/>DOT3\u3001DOT4\u3001DOT5\u3001DOT5.1<\/div><\/td>\r\n<td data-compare-model=\"as502\"><div class=\"autool-compare-matrix__value\">3 Types<br\/>DOT3\u3001DOT4\u3001DOT5.1<\/div><\/td>\r\n<td data-compare-model=\"as503\" hidden=\"\"><div class=\"autool-compare-matrix__value\"><span aria-label=\"No\" class=\"autool-compare-matrix__mark\" data-autool-state=\"no\" data-layout43-marker=\"\" role=\"img\">\u00d7<\/span><\/div><\/td>\r\n<td data-compare-model=\"as505\" hidden=\"\"><div class=\"autool-compare-matrix__value\"><span aria-label=\"No\" class=\"autool-compare-matrix__mark\" data-autool-state=\"no\" data-layout43-marker=\"\" role=\"img\">\u00d7<\/span><\/div><\/td>\r\n<td data-compare-model=\"as506\" hidden=\"\"><div class=\"autool-compare-matrix__value\">DOT3, DOT4 and DOT5.1 (procedure-confirmed selections)<\/div><\/td>\r\n<td data-compare-model=\"as507\" hidden=\"\"><div class=\"autool-compare-matrix__value\"><span aria-label=\"No\" class=\"autool-compare-matrix__mark\" data-autool-state=\"no\" data-layout43-marker=\"\" role=\"img\">\u00d7<\/span><\/div><\/td>\r\n<td data-compare-model=\"as509\" hidden=\"\"><div class=\"autool-compare-matrix__value\">23 Coolant Brands<br\/>For ACDELCO\u3001BASF\u3001BOSCH\u3001CASTROL\u3001ENGINE_ICE\u3001EVANS\u3001FORD\u3001HONDA\u3001JOHN_DEERE\u3001KUNLUN\u3001MOBIL\u3001MOPAR\u3001NISSAN\u3001OMTECH\u3001PEAK\u3001PRESTONE\u3001RECOCHEM\u3001SHELL\u3001SKI-DOO\u3001ZEREX\u3001STAR_BRITE\u3001TOTAL\u3001TOYOTA<\/div><\/td>\r\n<\/tr><tr class=\"autool-compare-matrix__category\" data-compare-category=\"layout-group-2\">\r\n<th class=\"autool-compare-matrix__category-label\" scope=\"rowgroup\"><span class=\"autool-compare-matrix__category-label-inner\">Measurement &amp; Response<\/span><\/th>\r\n<td class=\"autool-compare-matrix__category-track\" colspan=\"1\" data-compare-category-track=\"\"><span aria-hidden=\"true\" class=\"autool-compare-matrix__category-progress\" data-autool-progress-order-ready=\"yes\" data-compare-category-progress=\"\"><span class=\"autool-compare-matrix__category-progress-label\">Slide \/ drag<\/span><span class=\"autool-compare-matrix__category-progress-meter\"><span class=\"autool-compare-matrix__category-progress-bar\"><\/span><\/span><span class=\"autool-compare-matrix__category-progress-count\" data-compare-category-count=\"\">1 \/ 1<\/span><\/span><\/td>\r\n<\/tr><tr data-compare-group=\"layout-group-2\" data-compare-row=\"\">\r\n<th class=\"autool-compare-matrix__feature\" scope=\"row\">Temperature Unit Switching<\/th>\r\n<td data-compare-model=\"as501\" hidden=\"\"><div class=\"autool-compare-matrix__value\"><span aria-label=\"No\" class=\"autool-compare-matrix__mark\" data-autool-state=\"no\" data-layout43-marker=\"\" role=\"img\">\u00d7<\/span><\/div><\/td>\r\n<td data-compare-model=\"as502\"><div class=\"autool-compare-matrix__value\"><span aria-label=\"No\" class=\"autool-compare-matrix__mark\" data-autool-state=\"no\" data-layout43-marker=\"\" role=\"img\">\u00d7<\/span><\/div><\/td>\r\n<td data-compare-model=\"as503\" hidden=\"\"><div class=\"autool-compare-matrix__value\">\u2103\/\u2109<\/div><\/td>\r\n<td data-compare-model=\"as505\" hidden=\"\"><div class=\"autool-compare-matrix__value\">\u2103\/\u2109<\/div><\/td>\r\n<td data-compare-model=\"as506\" hidden=\"\"><div class=\"autool-compare-matrix__value\">\u2103\/\u2109<\/div><\/td>\r\n<td data-compare-model=\"as507\" hidden=\"\"><div class=\"autool-compare-matrix__value\">\u2103\/\u2109<\/div><\/td>\r\n<td data-compare-model=\"as509\" hidden=\"\"><div class=\"autool-compare-matrix__value\">\u2103\/\u2109<\/div><\/td>\r\n<\/tr><tr data-compare-group=\"layout-group-2\" data-compare-row=\"\">\r\n<th class=\"autool-compare-matrix__feature\" scope=\"row\">Temperature Measurement Range<\/th>\r\n<td data-compare-model=\"as501\" hidden=\"\"><div class=\"autool-compare-matrix__value\"><span aria-label=\"No\" class=\"autool-compare-matrix__mark\" data-autool-state=\"no\" data-layout43-marker=\"\" role=\"img\">\u00d7<\/span><\/div><\/td>\r\n<td data-compare-model=\"as502\"><div class=\"autool-compare-matrix__value\"><span aria-label=\"No\" class=\"autool-compare-matrix__mark\" data-autool-state=\"no\" data-layout43-marker=\"\" role=\"img\">\u00d7<\/span><\/div><\/td>\r\n<td data-compare-model=\"as503\" hidden=\"\"><div class=\"autool-compare-matrix__value\">0-85\u2103<br\/>0-185\u2109<\/div><\/td>\r\n<td data-compare-model=\"as505\" hidden=\"\"><div class=\"autool-compare-matrix__value\">0-85\u2103<br\/>0-185\u2109<\/div><\/td>\r\n<td data-compare-model=\"as506\" hidden=\"\"><div class=\"autool-compare-matrix__value\">0-320\u2103<br\/>0-608\u2109<\/div><\/td>\r\n<td data-compare-model=\"as507\" hidden=\"\"><div class=\"autool-compare-matrix__value\">0-85\u2103<br\/>0-185\u2109<\/div><\/td>\r\n<td data-compare-model=\"as509\" hidden=\"\"><div class=\"autool-compare-matrix__value\">Diluted Coolant Boiling Point Range\uff1a<br\/>100\u00b0C~120\u00b0C(212\u00b0F~248\u00b0F)<br\/><br\/>Original Manufacturer Coolant Boiling Point Reference Range<br\/>106\u00b0C~191\u00b0C(221\u00b0F~376\u00b0F)<br\/>\r\n<\/div><\/td>\r\n<\/tr><tr data-compare-group=\"layout-group-2\" data-compare-row=\"\">\r\n<th class=\"autool-compare-matrix__feature\" scope=\"row\">Test Duration<\/th>\r\n<td data-compare-model=\"as501\" hidden=\"\"><div class=\"autool-compare-matrix__value\">10s Response<\/div><\/td>\r\n<td data-compare-model=\"as502\"><div class=\"autool-compare-matrix__value\">10s Response<\/div><\/td>\r\n<td data-compare-model=\"as503\" hidden=\"\"><div class=\"autool-compare-matrix__value\">10s Response<\/div><\/td>\r\n<td data-compare-model=\"as505\" hidden=\"\"><div class=\"autool-compare-matrix__value\">10s Response<\/div><\/td>\r\n<td data-compare-model=\"as506\" hidden=\"\"><div class=\"autool-compare-matrix__value\">16s Response<\/div><\/td>\r\n<td data-compare-model=\"as507\" hidden=\"\"><div class=\"autool-compare-matrix__value\">10s Response<\/div><\/td>\r\n<td data-compare-model=\"as509\" hidden=\"\"><div class=\"autool-compare-matrix__value\">20~40s Response<\/div><\/td>\r\n<\/tr><tr class=\"autool-compare-matrix__category\" data-compare-category=\"layout-group-3\">\r\n<th class=\"autool-compare-matrix__category-label\" scope=\"rowgroup\"><span class=\"autool-compare-matrix__category-label-inner\">Display, Probe &amp; Power<\/span><\/th>\r\n<td class=\"autool-compare-matrix__category-track\" colspan=\"1\" data-compare-category-track=\"\"><span aria-hidden=\"true\" class=\"autool-compare-matrix__category-progress\" data-autool-progress-order-ready=\"yes\" data-compare-category-progress=\"\"><span class=\"autool-compare-matrix__category-progress-label\">Slide \/ drag<\/span><span class=\"autool-compare-matrix__category-progress-meter\"><span class=\"autool-compare-matrix__category-progress-bar\"><\/span><\/span><span class=\"autool-compare-matrix__category-progress-count\" data-compare-category-count=\"\">1 \/ 1<\/span><\/span><\/td>\r\n<\/tr><tr data-compare-group=\"layout-group-3\" data-compare-row=\"\">\r\n<th class=\"autool-compare-matrix__feature\" scope=\"row\">Backlit Display Screen<\/th>\r\n<td data-compare-model=\"as501\" hidden=\"\"><div class=\"autool-compare-matrix__value\">1.8-inch<\/div><\/td>\r\n<td data-compare-model=\"as502\"><div class=\"autool-compare-matrix__value\">2.8-inch<\/div><\/td>\r\n<td data-compare-model=\"as503\" hidden=\"\"><div class=\"autool-compare-matrix__value\">2.8-inch<\/div><\/td>\r\n<td data-compare-model=\"as505\" hidden=\"\"><div class=\"autool-compare-matrix__value\">2.8-inch<\/div><\/td>\r\n<td data-compare-model=\"as506\" hidden=\"\"><div class=\"autool-compare-matrix__value\">1.54-inch<\/div><\/td>\r\n<td data-compare-model=\"as507\" hidden=\"\"><div class=\"autool-compare-matrix__value\">2.8-inch<\/div><\/td>\r\n<td data-compare-model=\"as509\" hidden=\"\"><div class=\"autool-compare-matrix__value\">1.6-inch<\/div><\/td>\r\n<\/tr><tr data-compare-group=\"layout-group-3\" data-compare-row=\"\">\r\n<th class=\"autool-compare-matrix__feature\" scope=\"row\">Test Cable Length<\/th>\r\n<td data-compare-model=\"as501\" hidden=\"\"><div class=\"autool-compare-matrix__value\">26cm<\/div><\/td>\r\n<td data-compare-model=\"as502\"><div class=\"autool-compare-matrix__value\">26cm<\/div><\/td>\r\n<td data-compare-model=\"as503\" hidden=\"\"><div class=\"autool-compare-matrix__value\">80cm<\/div><\/td>\r\n<td data-compare-model=\"as505\" hidden=\"\"><div class=\"autool-compare-matrix__value\">80cm<\/div><\/td>\r\n<td data-compare-model=\"as506\" hidden=\"\"><div class=\"autool-compare-matrix__value\">4cm<\/div><\/td>\r\n<td data-compare-model=\"as507\" hidden=\"\"><div class=\"autool-compare-matrix__value\">80cm<\/div><\/td>\r\n<td data-compare-model=\"as509\" hidden=\"\"><div class=\"autool-compare-matrix__value\">130cm<\/div><\/td>\r\n<\/tr><tr data-compare-group=\"layout-group-3\" data-compare-row=\"\">\r\n<th class=\"autool-compare-matrix__feature\" scope=\"row\">Power Supply Voltage<\/th>\r\n<td data-compare-model=\"as501\" hidden=\"\"><div class=\"autool-compare-matrix__value\">3V<\/div><\/td>\r\n<td data-compare-model=\"as502\"><div class=\"autool-compare-matrix__value\">6V<\/div><\/td>\r\n<td data-compare-model=\"as503\" hidden=\"\"><div class=\"autool-compare-matrix__value\">6V<\/div><\/td>\r\n<td data-compare-model=\"as505\" hidden=\"\"><div class=\"autool-compare-matrix__value\">6V<\/div><\/td>\r\n<td data-compare-model=\"as506\" hidden=\"\"><div class=\"autool-compare-matrix__value\">12V<\/div><\/td>\r\n<td data-compare-model=\"as507\" hidden=\"\"><div class=\"autool-compare-matrix__value\">6V<\/div><\/td>\r\n<td data-compare-model=\"as509\" hidden=\"\"><div class=\"autool-compare-matrix__value\">10-14V<\/div><\/td>\r\n<\/tr><tr data-compare-group=\"layout-group-3\" data-compare-row=\"\">\r\n<th class=\"autool-compare-matrix__feature\" scope=\"row\">Hose Material<\/th>\r\n<td data-compare-model=\"as501\" hidden=\"\"><div class=\"autool-compare-matrix__value\">Iron Oxide<\/div><\/td>\r\n<td data-compare-model=\"as502\"><div class=\"autool-compare-matrix__value\">304 Stainless Steel<\/div><\/td>\r\n<td data-compare-model=\"as503\" hidden=\"\"><div class=\"autool-compare-matrix__value\">Teflon<\/div><\/td>\r\n<td data-compare-model=\"as505\" hidden=\"\"><div class=\"autool-compare-matrix__value\">Teflon<\/div><\/td>\r\n<td data-compare-model=\"as506\" hidden=\"\"><div class=\"autool-compare-matrix__value\"><span aria-label=\"No\" class=\"autool-compare-matrix__mark\" data-autool-state=\"no\" data-layout43-marker=\"\" role=\"img\">\u00d7<\/span><\/div><\/td>\r\n<td data-compare-model=\"as507\" hidden=\"\"><div class=\"autool-compare-matrix__value\">Teflon<\/div><\/td>\r\n<td data-compare-model=\"as509\" hidden=\"\"><div class=\"autool-compare-matrix__value\"><span aria-label=\"No\" class=\"autool-compare-matrix__mark\" data-autool-state=\"no\" data-layout43-marker=\"\" role=\"img\">\u00d7<\/span><\/div><\/td>\r\n<\/tr><\/tbody>\r\n<\/table>\r\n<\/div>\r\n<\/div>\r\n<\/div>\r\n<\/div>\r\n<\/div><\/section><section class=\"autool-section autool-product-section--cool autool-section--downloads\" data-autool-surface=\"cool\" id=\"autool-download\"><div class=\"autool-layout-container\">\r\n<header class=\"autool-section-head\"><p class=\"autool-subhead\">Manual &amp; Support<\/p>\r\n<h2 class=\"autool-title\">Find the Manual and Fluid-Test Guidance<\/h2><\/header><div aria-label=\"AS502 manual download and setup support\" class=\"autool-product-rail autool-resources-grid autool-mobile-rail\" data-autool-rail=\"resources\">\r\n<article class=\"autool-resource-download autool-resource-panel\"><div class=\"autool-resource-media\"><img loading=\"lazy\" alt=\"AUTOOL AS502 user manual cover\" decoding=\"async\" height=\"300\" loading=\"lazy\" src=\"https:\/\/autoolstore.com\/wp-content\/uploads\/2024\/03\/autool-as502-user-manual-pdf.jpg\" width=\"212\"\/> <\/div><div class=\"autool-resource-body\"><span class=\"autool-resource-meta\">Manual \/ PDF<\/span><h3>AUTOOL AS502 User Manual<\/h3><p>Open the PDF manual for AUTOOL AS502 brake-fluid selection, normal and expert modes, water-content screening, result interpretation, probe cleaning, safety and troubleshooting support.<\/p><div class=\"autool-resource-actions\"><a class=\"autool-product-button\" href=\"https:\/\/autoolstore.com\/wp-content\/uploads\/2024\/03\/autool-as502-user-manual.pdf\" rel=\"noopener\" target=\"_blank\">Download Manual<\/a><\/div><\/div><\/article><aside class=\"autool-resource-panel autool-section--support\" id=\"autool-support\"><div class=\"autool-resource-body\"><span class=\"autool-resource-meta\">Setup Help<\/span><h3>Need Help Choosing the Right Setup?<\/h3><p>Contact AUTOOL Store before ordering for help with manual versions, installation steps, compatibility, accessories, safe-use instructions, or after-sales support.<\/p><dl class=\"autool-support-list\"><div><dt>Email<\/dt><dd><a href=\"mailto:support@autoolstore.com\">support@autoolstore.com<\/a><\/dd><\/div><div><dt>WhatsApp<\/dt><dd><a href=\"https:\/\/wa.me\/8618926477404\" target=\"_blank\" rel=\"noopener\">+86 189 2647 7404<\/a><\/dd><\/div><\/dl><div class=\"autool-resource-actions\"><a class=\"autool-product-button\" href=\"mailto:support@autoolstore.com\">EMAIL<\/a><a class=\"autool-product-button\" href=\"https:\/\/wa.me\/8618926477404\" rel=\"noopener\" target=\"_blank\">WHATSAPP<\/a><\/div><\/div><\/aside>\r\n<\/div>\r\n<\/div><\/section><section class=\"autool-section autool-product-section--warm autool-section--package\" data-autool-surface=\"warm\" id=\"autool-box\"><div class=\"autool-layout-container\">\r\n<div class=\"autool-package-layout\">\r\n<figure class=\"autool-package-media\"><img decoding=\"async\" alt=\"AUTOOL AS502 packing list image showing brake fluid tester retail box and user manual\" src=\"https:\/\/autoolstore.com\/wp-content\/uploads\/2023\/11\/AUTOOL-AS502-Car-Brake-Fluid-Tester-For-Water-Content-Testing-12.png\"\/> <\/figure>\r\n<div class=\"autool-package-copy\"><p class=\"autool-subhead\">Package Contents<\/p>\r\n<h2 class=\"autool-title\">See What Comes in the Box<\/h2><ul aria-label=\"AS502 package contents\" class=\"autool-package-list autool-product-rail\" data-autool-rail=\"package\">\r\n<li>\r\n<span>Main Unit<\/span><strong>AUTOOL AS502 brake fluid tester with flexible probe<\/strong><\/li>\r\n<li>\r\n<span>Retail Box<\/span><strong>AS502 product packaging<\/strong><\/li>\r\n<li>\r\n<span>Item<\/span><strong>User Manual AS502 user manual<\/strong><\/li>\r\n<li>\r\n<span>Battery<\/span><strong> The tester uses 4 \u00d7 1.5V AAA batteries. Confirm whether batteries are included with your selected package before ordering.<\/strong><\/li>\r\n<\/ul><\/div>\r\n<\/div>\r\n<\/div><\/section><section class=\"autool-section autool-product-section--white autool-section--faq\" data-autool-nav=\"FAQ\" data-autool-surface=\"white\" id=\"autool-faq-description\"><div class=\"autool-layout-container\">\r\n<header class=\"autool-section-head\"><p class=\"autool-subhead\">Buyer Questions<\/p>\r\n<h2 class=\"autool-title\">Fluid Fit, Method and Result Questions<\/h2><\/header><div class=\"autool-faq-grid\">\r\n<details><summary>What Does AUTOOL AS502 Test?<\/summary><div class=\"autool-faq-answer\"><p>AUTOOL AS502 tests the water content percentage in brake fluid. It helps users evaluate brake fluid condition and decide whether maintenance or replacement may be needed.<\/p><\/div><\/details><details><summary>Which Brake Fluid Types Does AS502 Support?<\/summary><div class=\"autool-faq-answer\"><p>Normal mode supports DOT3, DOT4, and DOT5.1 brake fluid. Expert mode supports selected DOT4 brands, including MOTUL, ATE, FERODO, MOBIL, BREMBO, TRW, BOSCH, CASTROL, TOTAL, VALEO, FUCHS, and TEXTAR.<\/p><\/div><\/details><details><summary>What Batteries Does AS502 Use?<\/summary><div class=\"autool-faq-answer\"><p>AS502 uses 6V power from 4 \u00d7 1.5V AAA batteries. Open the rear battery cover, insert the batteries with the correct polarity, and close the cover securely before use.<\/p><\/div><\/details><details><summary>How Do I Use AS502 For A Brake Fluid Test?<\/summary><div class=\"autool-faq-answer\"><p>Clean the probe, open the brake fluid reservoir cap, select the correct brake fluid type or expert-mode brand, immerse the probe into the brake fluid, then press the test button. The screen will display the water content percentage and status indication.<\/p><\/div><\/details><details><summary>How Should I Read The Test Result?<\/summary><div class=\"autool-faq-answer\"><p>The percentage value shows the water content in the brake fluid. OK indicates the water content is good, ! indicates a warning, and \u00d7 indicates replacement is suggested. The manual describes 0%-2% as a pass range, 2%-3% as a warning range, and above 3% as a replacement range.<\/p><\/div><\/details><details><summary>How Often Should Brake Fluid Be Tested?<\/summary><div class=\"autool-faq-answer\"><p>For routine maintenance, checking brake fluid around every 40,000 km is recommended. Actual testing frequency should also follow the vehicle condition, driving environment, and service requirements.<\/p><\/div><\/details><details><summary>How Should I Maintain The Probe After Use?<\/summary><div class=\"autool-faq-answer\"><p>Wipe the probe clean after use and avoid leaving stains or brake fluid residue on the probe. If the tester will not be used for a long time, remove all batteries and store it in a dry place at normal room temperature.<\/p><\/div><\/details><details><summary>What Is The Difference Between AS502 And Other AUTOOL Fluid Testers?<\/summary><div class=\"autool-faq-answer\"><p>AS502 is for brake fluid water-content testing with a 2.8-inch display, 6V power, and normal\/expert modes. AS503 is for engine oil quality, AS505 is for transmission fluid, AS506 is for brake fluid boiling point, and AS507 is for power steering fluid. Choose by the fluid type and test principle you need.<\/p><\/div><\/details><details><summary>How Long Is The Warranty?<\/summary><div class=\"autool-faq-answer\"><p>Main unit: 3-year warranty. Standard accessories: 1-year warranty. <a href=\"https:\/\/autoolstore.com\/warranty-policy\/\" rel=\"noopener\" target=\"_blank\">Warranty Policy<\/a>.<\/p><\/div><\/details>\r\n<\/div>\r\n<\/div><\/section><\/main><\/div>\r\n\r\n","protected":false},"excerpt":{"rendered":"<ul>\n<li><strong>DOT3 \/ DOT4 \/ DOT5.1:<\/strong> Screen water content in supported DOT3, DOT4, and DOT5.1 brake fluids.<\/li>\n<li><strong>Normal + Expert Modes:<\/strong> Use standard fluid-type testing or select Expert mode for supported DOT4 brand references.<\/li>\n<li><strong>260 mm Flexible Probe:<\/strong> Reach brake-fluid reservoirs with the flexible gooseneck probe.<\/li>\n<li><strong>Water + Status Display:<\/strong> View water content with OK, warning, or suggested-replacement indicators on the 2.8-inch backlit screen.<\/li>\n<\/ul>\n","protected":false},"featured_media":79628,"comment_status":"open","ping_status":"closed","template":"","meta":{"_gspb_post_css":""},"product_brand":[448],"product_cat":[1063,1068],"product_tag":[956,940,939,946],"hf_cat_product":[4540],"class_list":["post-40035","product","type-product","status-publish","has-post-thumbnail","product_brand-autool","product_cat-automotive-repair-testing-equipment","product_cat-oil-analysis-tester","product_tag-fluid-testing","product_tag-measurement-tools","product_tag-multi-warehouse-shipping","product_tag-package-options","first","instock","shipping-taxable","purchasable","product-type-variable"],"meta_box":{"autool_archive_segment":"Pressure testing","autool_primary_use_case":"Pressure testing for engine, fuel, air or cooling systems","autool_customer_focus":["measurement accuracy","package choice","warehouse \/ delivery location"],"autool_source_summary":"- Pressure Checks Made Clear: Built for targeted pressure diagnosis in fuel, oil, cooling, or air systems where confirmation matters before repair. - Package Difference Is Clear: Single-unit and bundle options are easier","autool_model_family":"AS502","autool_voltage_options":"","autool_ship_from_options":"Germany\u3001United States\u3001United Kingdom\u3001China","autool_package_options":"AST605+AS502\u3001Only AS502","autool_accessory_options":"","autool_data_confidence":"site-content-derived","autool_manual_review_notes":""},"_links":{"self":[{"href":"https:\/\/autoolstore.com\/wp-json\/wp\/v2\/product\/40035","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/autoolstore.com\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/autoolstore.com\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/autoolstore.com\/wp-json\/wp\/v2\/comments?post=40035"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/autoolstore.com\/wp-json\/wp\/v2\/media\/79628"}],"wp:attachment":[{"href":"https:\/\/autoolstore.com\/wp-json\/wp\/v2\/media?parent=40035"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/autoolstore.com\/wp-json\/wp\/v2\/product_brand?post=40035"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/autoolstore.com\/wp-json\/wp\/v2\/product_cat?post=40035"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/autoolstore.com\/wp-json\/wp\/v2\/product_tag?post=40035"},{"taxonomy":"hf_cat_product","embeddable":true,"href":"https:\/\/autoolstore.com\/wp-json\/wp\/v2\/hf_cat_product?post=40035"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}