Pocket-Size Positive, Vacuum and Differential Pressure Readings
The PT503 measures positive, negative and differential pressure on compatible automotive and workshop ports, switches between six units and holds a reading for recording. Seven adapter sizes connect it to varied test points.
- -101 to 200 kPa
- ±0.5% FS
- 6 Pressure Units
- 7 Adapter Sizes
- Data Hold
Key Features
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Three Pressure Types
Positive, negative and differential pressure for intake manifold, brake booster, exhaust, crankcase and crankshaft-related checks within range.
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One-Button Data Hold
Lock the current reading so it stays visible for recording, comparison or reporting.
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Switchable Units
Change units on the gauge to match the service reference without manual conversion.
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Status at a Glance
The screen shows the pressure type with the selected unit, battery level and hold status.
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Startup Auto-Zero
The gauge zeroes and calibrates to atmospheric pressure each time it powers on.
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Compact, Reinforced Body
Small enough for field checks, with a reinforced housing and a backlight for dim work areas.
Model Comparison
| PT503 | PT520 | PT530 | |
|---|---|---|---|
| Display | 1.8-inch | 2.8-inch | 2.8-inch |
| Pressure range | -101 to 200 kPa | -100 to 200 kPa | -100 to 300 kPa |
| Accuracy | ±0.5% FS | ±0.3% FS | ±0.25% FS |
| Data storage | Data hold only | 29 sets | 29 sets |
| Flashlight | No | Yes | Yes |
| Magnetic back / toolbox | No / No | No / No | Yes / Yes |
What’s in the Box
- PT503 differential pressure gauge
- Measurement adapters
- Measurement hose and tubing
- User manual
- Retail box
How to Use
- Power on unpressurizedInstall the AAA batteries and switch on with no pressure applied so auto-zero stays accurate.
- Connect hose and adapterChoose the adapter for the test port and check the hose and connectors first.
- Select unit and backlightSwitch to the unit you need and turn on the backlight in dim areas.
- Hold and recordLock the reading with data hold before recording or comparing.
Pressure types, adapters, data hold and troubleshooting: PT503 user manual (PDF).
Good to Know
Caution
- Do not use beyond the maximum range of 200 kPa.
- Powering on under pressure can cause inaccurate readings.
- Use only suitable non-corrosive media.
Care
- Do not squeeze, sharply bend or block the silicone tube while measuring.
- Keep the gauge away from strong vibration, strong magnetic fields and rapid temperature changes.
- Replace the batteries if the battery indicator flashes or readings become unstable.
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