P300 High-Resolution Pressure Gauge

P300 Wireless Pressure Gauge
High-Resolution 0-300 psi Pressure Gauge
Digital Vacuum and Pressure/Temperature gauges also available

P300 450x450 300ppi
The P300 pressure gauge gives a technician a closer look at the system using it’s 0.2psi resolution. The P300 is useful for inert gas leak testing to minimize loss while finding and fixing small pin-hole leaks. The EPA says that 150psi is usually sufficient pressure during leak testing to find small leaks, and for this the P300 is the ideal tool. When testing small systems such as ice machines, the P300 can be used for quick, high accuracy results. Simply pair the P300 to the ION HVAC/R App™ for best results.  No more hoping all the leaks have been fixed, now you can know faster than ever with the Appion P300.


Digital "Stub" Gauge: No Hoses, No Manifold
NIST-Traceable accuracy with 5-point certification

Features and Benefits

  • Rubberized water resistant and dust tight housing (IP65 Rated)
  • Large, easy to read LCD with backlight
  • Direct connections minimize charge loss and leaks
  • Optional auto power off (15 minutes with no change)
  • Free ION HVAC/R App™ enables remote viewing on your smartphone or tablet

With the Bluetooth™ connection option, data from the Appion ION HVAC/R App™ can give verified record keeping for customers and inspectors. And with the accuracy of +/- 0.5% (following ASME 40.7 standards) with a unique downloadable calibration sheet, technicians can be confident that their system is tight.

InUse P300

Wireless Gauge Features with the ION HVAC/R App™

The ION HVAC/R App™ enables remote, real-time viewing for appION™ Wireless Digital Gauges.

Multiple, simultaneous remote readings are now possible. Easy-to-use and perfect for advanced system analysis on evolving, complex, high-efficiency systems.

Active gauge readings enable real-time system analysis, custom layout configuration, multiple alarms, and more. More functionality, less bulk.

The ION HVAC/R App™ is available on the App Store for iPhone, iPad, and iPod Touch.  The ION HVAC/R App™ for Android™ is available for download on Google Play.

Additional Features

Useful Information

P300 Operating Manual (PDF)

Technical Bulletins
Safely Handling ACR Tools

Always wear gloves and eye protection and follow proper safety practices when handling refrigerant.

Product Specifications

Range 0 to 300 psi
Usage High Resolution Measurements
Accuracy +/-0.5% (ASME B40.7 Grade 2A)*
Resolution 0.2 psi
Units psi, kg/cm2, bar, kPa, MPa
Max Overpressure 450 psi
Fitting 1/8" Male NPT
Included Adapters 1/8" F NPT to 1/4" M Flare
1/8" F NPT to 1/4" F Flare
* NIST Traceable

Dimensions and Power

Dimensions               4.4in. x 2.75in. x 1.2in. (113mm x 70mm x 30mm)

Weight                       6.8 oz (193 grams)

Power                        (3) AA Batteries

Battery Life               160 Hours**

Operating Temp         0° - 140°F (-17.8° - 60°C)

** Continuous usage with radio turned off

ION HVAC/R App Requirements

Android Version 4.3 or greater Bluetooth® 4.0
iOS Version 8.0 or greater Bluetooth® 4.0

Available for Download:
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