AUTOOL PT503 Mini differensialtrykkmåler
US$59.00
- Positive, Negative + Differential Pressure
- -101–200 kPa Range
- Six Pressure Units
- One-Button Data Hold
- Positive, Negative + Differential Pressure: Measure positive, negative, or differential pressure for compatible automotive and workshop paths.
- -101–200 kPa Range: Capture pressure changes across -101 to 200 kPa with accuracy up to ±0.5% FS.
- Six Pressure Units: Switch among psi, inHg, kPa, mbar, bar, and mmHg without manual conversion.
- One-Button Data Hold: Lock the current reading for recording or comparison after measurement.
- Seven Adapter Sizes: Connect to different pressure ports with seven included adapter sizes.
- Positive, Negative + Differential Pressure: Measure positive, negative, or differential pressure for compatible automotive and workshop paths.
- -101–200 kPa Range: Capture pressure changes across -101 to 200 kPa with accuracy up to ±0.5% FS.
- Six Pressure Units: Switch among psi, inHg, kPa, mbar, bar, and mmHg without manual conversion.
- One-Button Data Hold: Lock the current reading for recording or comparison after measurement.
- Seven Adapter Sizes: Connect to different pressure ports with seven included adapter sizes.
- 3-Year Warranty Main unit 3 years · Accessories 1 year
- 90-Day Returns Eligible returns within 90 days
- Official Store Genuine products · Direct support
AUTOOL PT503 · Differential Pressure Gauge
Measure Positive, Vacuum and Differential Pressure
Measure positive, negative, or differential pressure on compatible automotive and workshop paths. PT503 covers -101 to 200 kPa with up to ±0.5% FS accuracy, switches among six common pressure units, and holds a reading for recording or comparison. Seven adapter sizes help connect the handheld gauge to varied pressure ports.
- -101 To 200 kPa Range
- Positive / Negative / Differential
- Accuracy Up To ±0.5% FS
- Six Pressure Units
- Seven Adapter Sizes
Key Features
Three Pressure Modes in Six Units
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, negative, and differential pressure measurement. Use matching adapters for compatible automotive intake, brake-booster, exhaust, crankcase, and crankshaft-related pressure checks within the rated range.
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 reinforced 125 × 56 × 30 mm body weighs about 120 g for portable workshop and field checks. Use the listed measurement adapters for the required pressure ports.
Seven Adapter Sizes
Seven sizes of measurement adapters support connection to different pressure ports.
Pressure Status Display
Read positive pressure, negative pressure and differential pressure alongside the selected unit, battery level and data hold status.
5-Minute Auto Power-Off
The gauge automatically powers off after about 5 minutes without operation or applied pressure.
3 Years Warranty Support
Main unit: 3-year warranty. Standard accessories: 1-year warranty. Warranty Policy.
Service Workflow
Connect, Zero and Hold the Reading
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.
Safe Use
Keep Media and Pressure Within Range
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.
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.
Use 2×AAA Batteries
PT503 is powered by 2 × 1.5V AAA batteries. Replace batteries if the battery indicator flashes or readings become unstable.
Interpret the Result in Context
Confirm both pressure ports, the permitted medium and the expected positive, negative or differential range before connection. Interpret the difference against the exact system and operating condition.
Protect Measurement Stability
Keep the gauge away from strong vibration, strong magnetic fields, and rapid temperature changes during measurement.
Model Comparison
Choose the Right Pressure Test Kit
Model Guide
Choose one or more models. PT503 is selected by default.
| Product Model | PT503 | PT520 | PT530 | PT660 |
|---|---|---|---|---|
| Pressure Measurement & Display | ||||
| Display Screen | 1.8-inch | 2.8-inch | 2.8-inch | 3-inch |
| Pressure Range | -101~200Kpa | -100~200Kpa | -100~300Kpa | 0–210 bar |
| Measurement Accuracy | ±0.5%Fs | ±0.3%FS | ±0.25%FS | ±1%FS |
| Resolution | 0.1kPa | 1hpa, 0.1Kpa | 1hpa, 0.1Kpa | 0.1bar |
| Backlit Display Screen | ✓ | ✓ | ✓ | ✓ |
| Dual-Channel Pressure Testing | Simultaneously Measure the Pressure at Two Different Locations | Simultaneously Measure the Pressure at Two Different Locations | Simultaneously Measure the Pressure at Two Different Locations | Two brake positions/calipers via L/R channels |
| Multi-Parameter Display | Positive Pressure Value Negative Pressure Value | Positive Pressure Value Negative Pressure Value | Positive Pressure Value Negative Pressure Value | Left/right real-time pressure, minimum, maximum, and front/rear pressure difference |
| Pressure Units | psi inHg Kpa mbar bar mmHg | Kpa hPa Torr mbar inHg mmHg inH2O mmH2O psi kg/cm2 | Kpa hPa Torr mbar inHg mmHg inH2O mmH2O psi kg/cm2 | psi / bar / kg/cm² |
| Data Controls & Equipment | ||||
| Data Storage | × | 29 Sets | 29 Sets | Locks the current reading; check the current specification for multi-record storage. |
| Button Light Design | × | × | ✓ | ✓ |
| Magnetic Design on the Back | × | × | ✓ | ✓ |
| Flashlight Function | × | ✓ | ✓ | ✓ |
| Data Lock/Clear/Record | Data Lock | ✓ | ✓ | ✓ |
| Connections & Applications | ||||
| Accessory Connectors | 7 Types | 7 Types | 7 Types | Check the selected package contents for included adapter types and quantities. |
| Equipped Toolbox | × | × | ✓ | ✓ |
| Applicable Scenarios | Intake Manifold Brake Booster Crankcase (Non-corrosive Oil, Water, Air, Natural Gas) | Intake Manifold Brake Booster Crankcase (Non-corrosive Oil, Water, Air, Natural Gas) | Intake Manifold Brake Booster Crankcase (Non-corrosive Oil, Water, Air, Natural Gas) | Internal brake-system fluid pressure; two-position/caliper comparison |
Manual & Support
Find the Manual and Adapter Guidance
AUTOOL PT503 User Manual
Open the PDF manual for AUTOOL PT503 pressure type and unit selection, adapter setup, data hold, result interpretation, safe connection and troubleshooting support.
Package Contents
See What Comes in the Box
- Main UnitAUTOOL PT503 mini differential pressure gauge
- DocumentationAUTOOL PT503 user manual
- PackageRetail box
- AdaptersMeasurement adapters
- Hose / TubingMeasurement hose and tubing
- ItemMain unit: 3-year warranty. Standard accessories: 1-year warranty. Warranty Policy.
Buyer Questions
Pressure Connection and Reading Questions
What Pressure Types Can PT503 Measure?
PT503 can measure positive pressure, negative pressure, and differential pressure. It is suitable for compact automotive diagnostic pressure checks when the pressure range and connector setup match the test point.
What Is The Measurement Range Of PT503?
The PT503 testing range is -101kPa ~ 200kPa. Its accuracy is up to ±0.5%FS, and its kPa resolution is 0.1kPa.
What Pressure Units Does PT503 Support?
PT503 supports 6 pressure units: psi, inHg, kPa, mbar, bar, and mmHg. Switch to the correct unit before recording or comparing readings.
What Batteries Does PT503 Use?
PT503 uses 2 × 1.5V AAA batteries. Replace the batteries if the battery indicator flashes, the display becomes unstable, or the gauge cannot operate normally.
Can PT503 Lock Measurement Data?
Yes. PT503 supports a data hold function. Use it to lock the current reading when you need to record, compare, or report the pressure value.
How Do I Switch Units Or Use The 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. Refer to the PT503 manual for the exact key operation sequence.
Can I Power On PT503 While Pressure Is Applied?
No. Power on the gauge without pressure applied. PT503 performs startup zeroing and atmospheric pressure calibration, so powering on under pressure may cause inaccurate measurements.
What Should I Check Before Measurement?
Check the batteries, hose, adapter, connector fit, and pressure range before testing. Avoid squeezing the silicone tube, and do not use the gauge beyond the 200kPa maximum range.
What Is The Difference Between PT503, PT520, And PT530?
PT503 focuses on mini portability and quick field testing. PT520 is a larger digital manometer option with a bigger display, data storage, and higher accuracy. PT530 is the higher-level option with a wider -100~300kPa range, higher ±0.25%FS accuracy, storage support, magnetic back, button light, and tool box configuration.
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