When you go in to the customers house turn on The A/C take WB (wet bulb) reading at the return air grill then go outside and take a dry bulb measurement at condensing unit or heat pump use your measurements with your refrigerant gauges. And calculate your subcooling or superheat depending on weather you have a TXV or not, I just enter the values in to my SMAN4 gauges and it calculates it for me the I either add or remove (reclaim) refrigerant to reach my subcooling or superheat or you can type in Fieldpiece PRH2 in to You Tube and watch a video on how to use it

Tip diameter and lenght? For measuring WB temp of air entering and leaving evaporator?

The PRH2 is an economical, stand-alone psychrometer that measures wet bulb, %RH, dew point and dry bulb temperatures, all in the convenience of a pocket tool. Portable enough to clip into a pocket, the PRH2 is great for walk-around testing, and the pen-like psychrometer features a slim, 2” long tip to take measurements easily inside ductwork. The PRH2 has a bright backlight so it’s easy to read in dark areas and runs on a single AA-battery that lasts up to 100 hours.

In what way is this device a psychomotor?

It's not a psychomotor, it's a psychrometer.

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🔧 Elevate Your HVAC Game with Precision!

SENSOR PROTECTION - Twist cap ensures your sensors stay safe when not in use.
PRECISION INSERTION - Narrow tip designed for seamless access into ductwork.
USER FRIENDLY DISPLAY - Bright backlight for clear readings in any lighting.
VERSATILE APPLICATIONS - Perfect for both walk-around testing and in-duct analysis.
POCKET SIZED CONVENIENCE - Easily clip it to your pocket for on-the-go testing.

The Fieldpiece PRH2 Digital Psychomotor is a versatile tool designed for HVAC professionals, offering a compact, pocket-sized design for easy transport. With a narrow tip for precise ductwork insertion, a protective twist cap for sensor longevity, and a bright backlight for visibility, this device is perfect for both walk-around testing and in-duct analysis.