AUTOOL PT503 Mini Differential Pressure Gauge

AUTOOL PT503

Product Overview

The AUTOOL PT503 is a compact mini differential pressure gauge for positive pressure, negative pressure, and differential pressure measurement. It is designed for portable on-site testing, automotive intake, brake booster, exhaust, crankcase or crankshaft-related pressure checks, and quick mobile diagnostic work. With a high-precision pressure sensor, 6 switchable pressure units, data hold, a backlit LCD display, and a reinforced portable body, PT503 helps users capture and record pressure changes clearly in workshop or field environments.

Positive / Negative / Differential ±0.5%FS Accuracy 6 Pressure Units Data Hold

-101~200kPaTesting Range

0.1kPakPa Resolution

2×AAABattery Power

3 YearsWarranty

AUTOOL PT503 mini differential pressure gauge main product image for automotive pressure testing

Key Features

PT503 combines accurate pressure sensing, a readable backlit display, one-button data hold, 6-unit switching, portable body design, and adapter support in a compact diagnostic gauge.

High-Precision Sensor

Measures from -101kPa to 200kPa with accuracy up to ±0.5%FS, helping users capture subtle pressure changes during diagnostic and maintenance work.

Three Pressure Types

Supports positive pressure, negative pressure, and differential pressure measurement for compact automotive and general pressure testing workflows.

1.8-Inch Backlit LCD

The LCD backlit display helps users read pressure values clearly in bright, dim, workshop, or field testing environments.

One-Button Data Hold

Lock the current reading for easier recording, comparison, or reporting when the pressure value needs to remain visible after measurement.

6 Switchable Units

Switch between psi, inHg, kPa, mbar, bar, and mmHg without manual conversion, making the pressure result easier to match to different service references.

Portable Body & Adapters

The 125 × 56 × 30mm body weighs about 120g and works with the included measurement adapters shown in the package image for different pressure ports.

AUTOOL PT503 high precision sensor range accuracy and resolution feature

AUTOOL PT503 1.8 inch LCD backlit display feature

AUTOOL PT503 data holding function feature

AUTOOL PT503 six pressure units switch feature

AUTOOL PT503 portable design size and weight feature

AUTOOL PT503 versatile measurement adapters for different connector sizes

Specifications

PT503 Product Specifications

Review the key measurement, power, display, environment, and body specifications before choosing PT503 for compact pressure testing.

Measurement
Product	AUTOOL PT503 Mini Differential Pressure Gauge
Pressure Types	Positive pressure, negative pressure, and differential pressure
Testing Range	-101kPa ~ 200kPa
Accuracy	±0.5%FS
Resolution	0.01psi / 0.01inHg / 0.1kPa / 1mbar / 0.001bar / 1mmHg
Pressure Units	psi, inHg, kPa, mbar, bar, mmHg
Power And Environment
Power Supply	2 × 1.5V AAA batteries
Operating Temperature	-10°C ~ 60°C
Storage Temperature	-20°C ~ 70°C
Auto Power-Off	Automatically powers off after about 5 minutes of no operation or no pressure
Body And Display
Display	1.8-inch LCD backlit display
Product Size	125 × 56 × 30mm
Product Weight	About 120g
Adapter Reference	Multiple measurement adapters are included as shown in the package and adapter images
Warranty	3-year warranty for eligible non-human damage cases and lifetime maintenance support

AUTOOL PT503 product specifications size weight pressure range and accuracy image

Measurement

Pressure TypesPositive / Negative / Differential

Testing Range-101kPa ~ 200kPa

Accuracy±0.5%FS

Resolution0.01psi / 0.01inHg / 0.1kPa / 1mbar / 0.001bar / 1mmHg

Unitspsi / inHg / kPa / mbar / bar / mmHg

Power And Body

Power Supply2 × 1.5V AAA batteries

Display1.8-inch LCD backlit display

Product Size125 × 56 × 30mm

Product WeightAbout 120g

Auto Power-OffAbout 5 minutes of no operation or no pressure

Applications

Use PT503 for compact automotive pressure, negative-pressure, and differential-pressure checks when the measurement range and connector setup match the test point.

Intake Manifold Testing

Use PT503 to support intake system pressure or negative-pressure checks during engine diagnostic work.

Brake Booster Testing

Assist brake booster pressure or vacuum-related checks with the correct connector and safe measurement setup.

Crankcase Pressure Checks

Use the gauge for crankcase or crankshaft-related pressure variation checks during vehicle maintenance and troubleshooting.

Exhaust And General Checks

Support exhaust and general low-pressure diagnostic checks within the PT503 measurement range and suitable media conditions.

AUTOOL PT503 brake booster intake manifold and crankcase pressure testing applications

How To Use

Install batteries, let the gauge zero in open air, connect the correct hose and adapter, select the display unit, and lock the reading when you need to record the result.

Install Batteries And Power On

Install 2 × 1.5V AAA batteries. Power on the gauge without pressure applied so the startup auto-zero and atmospheric pressure calibration remain accurate.

Connect Hose And Adapter

Choose the correct hose and adapter for the test port. Check the hose, adapter, and connector condition before starting measurement.

Select Unit And Backlight

Use the unit function to switch between psi, inHg, kPa, mbar, bar, and mmHg. Use the backlight function when the working area is dim.

Hold And Record Data

Use the data hold function to lock the reading before recording, comparing, or reporting the pressure value.

Use Notes

Do not power on the PT503 while pressure is already applied.
Do not exceed the 200kPa maximum measurement range.
Avoid squeezing or sharply bending the silicone tube during testing.
Replace the batteries if the battery indicator flashes or the reading becomes unstable.
The gauge can automatically power off after about 5 minutes of no operation or no pressure.

AUTOOL PT503 product structure positive pressure port negative pressure port display buttons and battery compartment

AUTOOL PT503 interface display symbols pressure unit data lock battery and backlight indicators

Product Comparison

PT503 is the mini portable option for quick on-site pressure testing. Compare it with PT520 and PT530 if you need a larger screen, data storage, higher accuracy, or a wider measurement range.

Choose PT503 IfYou need a mini portable gauge with a 1.8-inch display, -101~200kPa range, ±0.5%FS accuracy, and simple field use.

Choose PT520 IfYou prefer a larger 2.8-inch display, 29 groups of data storage, and higher ±0.3%FS accuracy for a more complete digital manometer setup.

Choose PT530 IfYou need a higher-level dual-port differential pressure gauge with -100~300kPa range, ±0.25%FS accuracy, storage support, magnetic back, button light, and tool box configuration.

Shared ApplicationsAll three models can support intake manifold, brake booster, crankcase, and suitable pressure testing scenarios when the test setup is correct.

Decision CheckCompare portability, display size, data storage, accuracy, range, adapters, application scope, and budget before ordering.

AUTOOL PT503 PT520 PT530 digital manometer comparison chart

AUTOOL PT503 packing list with main unit manual retail box adapters and hose

What Is In The Box

The packing image shows the PT503 main unit and included accessories. Use the package image as the final visual reference before ordering.

Main UnitAUTOOL PT503 mini differential pressure gauge

DocumentationAUTOOL PT503 user manual

PackageRetail box shown in the package image

AdaptersMeasurement adapters shown in the package image

Hose / TubingMeasurement hose and tubing shown in the package image

Support3-year warranty and lifetime maintenance support

Manual And Downloads

Download the AUTOOL PT503 EN-DE manual for setup, unit switching, data hold, display reference, measurement preparation, and operation guidance.

AUTOOL PT503 mini differential pressure gauge manual preview

AUTOOL PT503 User Manual

Open the PDF manual for pressure unit switching, data lock, measurement setup, display icons, battery use, and safe operation.

Download Manual

Need PT503 Setup Help?

Contact AUTOOL Store for adapter confirmation, unit switching, data hold, battery setup, differential pressure testing, manual support, or model selection help.

Emailsupport@autoolstore.com WhatsApp+86 189 2647 7404

Before You Order And Use

Confirm the PT503 measurement range, battery requirement, connector setup, startup condition, and use limits before measurement.

Do Not Exceed 200kPa

PT503 measures up to 200kPa. Do not use it beyond the maximum measurement range.

Power On Without Pressure

The gauge performs startup zeroing and atmospheric pressure calibration. Powering on under pressure may cause inaccurate readings.

Use 2×AAA Batteries

PT503 is powered by 2 × 1.5V AAA batteries. Replace batteries if the battery indicator flashes or readings become unstable.

Check Hose And Adapter

Before testing, check the hose, adapter, battery condition, and connector fit to avoid unstable or incorrect measurements.

Avoid Tube Compression

Do not squeeze, sharply bend, or block the silicone tube during measurement, because this may affect the pressure reading.

Use Suitable Media

Use PT503 only with suitable non-corrosive test media and the correct connector setup for the pressure port being measured.

Additional Use Reminders

Keep the gauge away from strong vibration, strong magnetic fields, and rapid temperature changes during measurement.
Use the correct pressure unit before recording values.
Use data hold before writing down or comparing readings.
For a larger display, data storage, or higher accuracy, compare PT503 with PT520 and PT530 before ordering.

Questions And Answers

These answers cover pressure types, measurement range, units, batteries, data hold, operation, startup zeroing, preparation checks, and PT503 / PT520 / PT530 model selection.

What Pressure Types Can PT503 Measure?

What Is The Measurement Range Of PT503?

What Pressure Units Does PT503 Support?

What Batteries Does PT503 Use?

Can PT503 Lock Measurement Data?

How Do I Switch Units Or Use The Backlight?

Can I Power On PT503 While Pressure Is Applied?

What Should I Check Before Measurement?

What Is The Difference Between PT503, PT520, And PT530?

Warranty And Contact

For PT503 setup, adapter confirmation, battery use, unit switching, data hold, differential pressure testing, warranty, or PT503 / PT520 / PT530 model selection support, contact AUTOOL Store.

Pre-Sales And Product Support

Use support if you need help confirming whether PT503 fits your intake, brake booster, exhaust, crankcase, or general pressure test needs, or if you need help choosing between PT503, PT520, and PT530.

3-year warranty for eligible non-human damage cases
Lifetime maintenance support
Manual download and setup confirmation
Adapter, hose, battery, unit switching, and data hold support
Pressure range and suitable media confirmation
PT503 / PT520 / PT530 model selection support

Email Supportsupport@autoolstore.com WhatsApp Support+86 189 2647 7404

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