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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Our Other Brands:Hewyn|Selfship

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NZ$258

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Description

📐 Precision in your pocket, performance in your hands.

IN DUCT READY - Narrow tip design slips effortlessly into ductwork for accurate in-duct analysis.
BACKLIT BRILLIANCE - Bright backlight guarantees clear readings even in dim or cramped spaces.
POCKET SIZED POWER - Clip it on and carry precision wherever you go—like a pen, but smarter.
SENSOR SAFETY FIRST - Twist cap shields sensitive sensors, ensuring durability on every job site.
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 HVAC professionals to quickly and accurately measure key psychrometric parameters including relative humidity, wet bulb, dew point, and dry bulb temperatures. Designed in the USA, its narrow tip and protective twist cap make it ideal for both walk-around testing and in-duct analysis, while the bright backlit display ensures usability in any environment.

Specifications

ASIN	B0087SD43W
Best Sellers Rank	#75,885 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #99 in Multi Testers
Brand	Fieldpiece
Brand Name	Fieldpiece
Customer Reviews	4.6 out of 5 stars 707 Reviews
Included Components	Meter
Item Dimensions	0.09 x 3 x 2 inches
Item Weight	3.2 Ounces
Item dimensions L x W x H	0.09 x 3 x 2 inches
Manufacturer	Fieldpiece Instruments Inc
Measurement Type	Psychrometer
Model	PRH2
Part Number	PRH2
Power Source	Battery Powered
Specification Met	Some
Style	Digital
Style Name	Digital
UPC	872641002664 696335209166
Unit Count	1.0 Count
Upper Temperature Rating	120 Degrees Celsius

Reviews

A**N

18.02.2026

K**N

17.01.2026

V**N

15.06.2021

H**E

23.11.2020

C**Y

17.10.2023

C**N

28.05.2025

B**O

18.12.2017

D**S

11.08.2018

N**K

20.04.2025

T**A

28.11.2024

Z**R

21.03.2018

L**S

23.08.2020

F**R

3.11.2018

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NZ$258

Duties & taxes included

In stock

Sold byAmazon New ZealandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to New Zealand.

Secure transaction

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Fieldpiece PRH2 Digital Psychomotor

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Common Questions