{"id":58535,"date":"2025-07-24T06:01:49","date_gmt":"2025-07-24T06:01:49","guid":{"rendered":"https:\/\/shop.autooltech.com\/?post_type=product&p=58535"},"modified":"2026-05-15T06:42:02","modified_gmt":"2026-05-15T13:42:02","slug":"autool-pt503-mini-differential-pressure-gauge","status":"publish","type":"product","link":"https:\/\/autoolstore.com\/sk\/product\/autool-pt503-mini-differential-pressure-gauge\/","title":{"rendered":"AUTOOL PT503 Mini Differential Pressure Gauge"},"content":{"rendered":"
\n
\n
\n
\n
AUTOOL PT503<\/div>\n

Product Overview<\/h2>\n

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.<\/p>\n

\n Positive \/ Negative \/ Differential<\/span>\n \u00b10.5%FS Accuracy<\/span>\n 6 Pressure Units<\/span>\n Data Hold<\/span>\n <\/div>\n
\n
-101~200kPa<\/span>Testing Range<\/span><\/div>\n
0.1kPa<\/span>kPa Resolution<\/span><\/div>\n
2\u00d7AAA<\/span>Battery Power<\/span><\/div>\n
3 Years<\/span>Warranty<\/span><\/div>\n <\/div>\n <\/div>\n
\n \"AUTOOL\n \n Click to enlarge<\/span>\n <\/figure>\n <\/div>\n <\/section>\n\n
\n
\n
Key Features<\/div>\n

Key Features<\/h2>\n

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.<\/p>\n <\/div>\n

\n
\n

High-Precision Sensor<\/h3>\n

Measures from -101kPa to 200kPa with accuracy up to \u00b10.5%FS, helping users capture subtle pressure changes during diagnostic and maintenance work.<\/p>\n <\/article>\n

\n

Three Pressure Types<\/h3>\n

Supports positive pressure, negative pressure, and differential pressure measurement for compact automotive and general pressure testing workflows.<\/p>\n <\/article>\n

\n

1.8-Inch Backlit LCD<\/h3>\n

The LCD backlit display helps users read pressure values clearly in bright, dim, workshop, or field testing environments.<\/p>\n <\/article>\n

\n

One-Button Data Hold<\/h3>\n

Lock the current reading for easier recording, comparison, or reporting when the pressure value needs to remain visible after measurement.<\/p>\n <\/article>\n

\n

6 Switchable Units<\/h3>\n

Switch between psi, inHg, kPa, mbar, bar, and mmHg without manual conversion, making the pressure result easier to match to different service references.<\/p>\n <\/article>\n

\n

Portable Body & Adapters<\/h3>\n

The 125 \u00d7 56 \u00d7 30mm body weighs about 120g and works with the included measurement adapters shown in the package image for different pressure ports.<\/p>\n <\/article>\n <\/div>\n

\n
\"AUTOOL\n Click to enlarge<\/span>\n <\/figure>\n
\"AUTOOL\n Click to enlarge<\/span>\n <\/figure>\n
\"AUTOOL\n Click to enlarge<\/span>\n <\/figure>\n
\"AUTOOL\n Click to enlarge<\/span>\n <\/figure>\n
\"AUTOOL\n Click to enlarge<\/span>\n <\/figure>\n
\"AUTOOL\n Click to enlarge<\/span>\n <\/figure>\n <\/div>\n <\/section>\n\n
\n
\n
Specifications<\/div>\n

PT503 Product Specifications<\/h2>\n

Review the key measurement, power, display, environment, and body specifications before choosing PT503 for compact pressure testing.<\/p>\n <\/div>\n\n

\n
\n \n\n
Measurement<\/td><\/tr>\n
Product<\/td>AUTOOL PT503 Mini Differential Pressure Gauge<\/td><\/tr>\n
Pressure Types<\/td>Positive pressure, negative pressure, and differential pressure<\/td><\/tr>\n
Testing Range<\/td>-101kPa ~ 200kPa<\/td><\/tr>\n
Accuracy<\/td>\u00b10.5%FS<\/td><\/tr>\n
Resolution<\/td>0.01psi \/ 0.01inHg \/ 0.1kPa \/ 1mbar \/ 0.001bar \/ 1mmHg<\/td><\/tr>\n
Pressure Units<\/td>psi, inHg, kPa, mbar, bar, mmHg<\/td><\/tr>\n
Power And Environment<\/td><\/tr>\n
Power Supply<\/td>2 \u00d7 1.5V AAA batteries<\/td><\/tr>\n
Operating Temperature<\/td>-10\u00b0C ~ 60\u00b0C<\/td><\/tr>\n
Storage Temperature<\/td>-20\u00b0C ~ 70\u00b0C<\/td><\/tr>\n
Auto Power-Off<\/td>Automatically powers off after about 5 minutes of no operation or no pressure<\/td><\/tr>\n
Body And Display<\/td><\/tr>\n
Display<\/td>1.8-inch LCD backlit display<\/td><\/tr>\n
Product Size<\/td>125 \u00d7 56 \u00d7 30mm<\/td><\/tr>\n
Product Weight<\/td>About 120g<\/td><\/tr>\n
Adapter Reference<\/td>Multiple measurement adapters are included as shown in the package and adapter images<\/td><\/tr>\n
Warranty<\/td>3-year warranty for eligible non-human damage cases and lifetime maintenance support<\/td><\/tr>\n <\/tbody>\n <\/table>\n <\/div>\n
\n \"AUTOOL\n \n Click to enlarge<\/span>\n <\/figure>\n<\/div>\n \n
\n
\n Measurement<\/summary>\n
\n
Pressure Types<\/span>Positive \/ Negative \/ Differential<\/strong><\/div>\n
Testing Range<\/span>-101kPa ~ 200kPa<\/strong><\/div>\n
Accuracy<\/span>\u00b10.5%FS<\/strong><\/div>\n
Resolution<\/span>0.01psi \/ 0.01inHg \/ 0.1kPa \/ 1mbar \/ 0.001bar \/ 1mmHg<\/strong><\/div>\n
Units<\/span>psi \/ inHg \/ kPa \/ mbar \/ bar \/ mmHg<\/strong><\/div>\n <\/div>\n <\/details>\n
\n Power And Body<\/summary>\n
\n
Power Supply<\/span>2 \u00d7 1.5V AAA batteries<\/strong><\/div>\n
Display<\/span>1.8-inch LCD backlit display<\/strong><\/div>\n
Product Size<\/span>125 \u00d7 56 \u00d7 30mm<\/strong><\/div>\n
Product Weight<\/span>About 120g<\/strong><\/div>\n
Auto Power-Off<\/span>About 5 minutes of no operation or no pressure<\/strong><\/div>\n <\/div>\n <\/details>\n <\/div>\n <\/section>\n\n
\n
\n
\n
\n
Applications<\/div>\n

Applications<\/h2>\n

Use PT503 for compact automotive pressure, negative-pressure, and differential-pressure checks when the measurement range and connector setup match the test point.<\/p>\n <\/div>\n

\n
\n

Intake Manifold Testing<\/h3>\n

Use PT503 to support intake system pressure or negative-pressure checks during engine diagnostic work.<\/p>\n <\/article>\n

\n

Brake Booster Testing<\/h3>\n

Assist brake booster pressure or vacuum-related checks with the correct connector and safe measurement setup.<\/p>\n <\/article>\n

\n

Crankcase Pressure Checks<\/h3>\n

Use the gauge for crankcase or crankshaft-related pressure variation checks during vehicle maintenance and troubleshooting.<\/p>\n <\/article>\n

\n

Exhaust And General Checks<\/h3>\n

Support exhaust and general low-pressure diagnostic checks within the PT503 measurement range and suitable media conditions.<\/p>\n <\/article>\n <\/div>\n \n<\/div>\n

\n \"AUTOOL\n \n Click to enlarge<\/span>\n <\/figure>\n<\/div>\n<\/section>\n\n
\n
\n
How To Use<\/div>\n

How To Use<\/h2>\n

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.<\/p>\n <\/div>\n

\n
\n

Install Batteries And Power On<\/h3>\n

Install 2 \u00d7 1.5V AAA batteries. Power on the gauge without pressure applied so the startup auto-zero and atmospheric pressure calibration remain accurate.<\/p>\n <\/article>\n

\n

Connect Hose And Adapter<\/h3>\n

Choose the correct hose and adapter for the test port. Check the hose, adapter, and connector condition before starting measurement.<\/p>\n <\/article>\n

\n

Select Unit And Backlight<\/h3>\n

Use the unit function to switch between psi, inHg, kPa, mbar, bar, and mmHg. Use the backlight function when the working area is dim.<\/p>\n <\/article>\n

\n

Hold And Record Data<\/h3>\n

Use the data hold function to lock the reading before recording, comparing, or reporting the pressure value.<\/p>\n <\/article>\n <\/div>\n

\n
\n
\n

Use Notes<\/h3>\n