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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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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Fieldpiece PRH2 Digital Psychomotor

Product ID: 2171008

Details

Brand
Fieldpiece
Item Weight
3.2 Ounces
Item dimensions L x W x H
0.09 x 3 x 2
Power Source
Battery
Style
Digital

💡Bright backlit display

📏Pocket-sized precision

🔒Sensor protection twist cap

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€ 173.04

Duties & taxes included

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Sold byAmazon FranceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

📐 Precision in your pocket, performance in your hands.

IN DUCT READY - Narrow tip designed for seamless insertion into ductwork for accurate in-situ readings.
POCKET SIZED POWER - Clip it like a pen and carry precision wherever you go.
SENSOR SAFETY FIRST - Twist cap shields sensitive sensors, ensuring durability on the job.
BRIGHT BACKLIGHT DISPLAY - Work confidently in low-light environments with a clear, illuminated screen.
RAPID PSYCHROMETRIC READINGS - Instantly measure humidity, wet bulb, dew point, and dry bulb temps with unmatched speed.

The Fieldpiece PRH2 Digital Psychromotor is a compact, battery-powered tool engineered for fast, accurate psychrometric measurements including relative humidity, wet bulb, dew point, and dry bulb temperatures. Designed with a narrow tip for duct insertion and a protective twist cap, it features a bright backlit display for easy reading in any environment. Manufactured in the USA by Fieldpiece Instruments Inc, it’s a trusted choice for HVAC professionals seeking reliable, on-the-go diagnostics.

Specifications

ASIN	B0087SD43W
Best Sellers Rank	#56,172 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #81 in Multi Testers
Brand Name	Fieldpiece
Customer Reviews	4.6 4.6 out of 5 stars (710)
Included Components	Meter
Item Dimensions	0.09 x 3 x 2 inches
Item Weight	3.2 Ounces
Manufacturer	Fieldpiece Instruments Inc
Measurement Type	Psychrometer
Model	PRH2
Part Number	PRH2
Power Source	Battery Powered
Specification Met	Some
Style Name	Digital
UPC	872641002664 696335209166
Unit Count	1.0 Count
Upper Temperature Rating	120 Degrees Celsius

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