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Fieldpiece PRH2 – Digital Pocket Psychrometer – HVACR

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103 in stock

SKU: fp_prh2 Categories: , Brand:

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This Fieldpiece PRH2 is an economical digital psychrometer that fits in your pocket. The Fieldpiece Psychrometer is great for walk-around testing. The pen-like psychrometer features a slim, 2” long tip to take measurements easily inside the ductwork. Also, get real-time, instant readings, all in the convenience of a pocket tool. Wet bulb, dry bulb, dew point, and %RH are shown on the backlight, dual display. Measurements can be taken either in the duct or while walking around. Also, it’s a must-have for every HVACR professional. The PRH2 runs on a single AA battery that lasts up to 100 hours.

Fieldpiece Instruments makes tools exclusively for HVACR professionals for on-the-go HVACR field service. Moreover, “this Fieldpiece PRH2 ultra-portable psychrometer is the new must-have tool for techs,” said Russell Harju, product manager. “We engineer every one of our tools to fit HVACR professionals’ needs specifically, so we packed the measurements that techs use most in a slim, pocket tool. So it’s handy no matter where they are on the job site, plus it has a bright backlight, so it’s easy to read in dark areas.”

The Fieldpiece PRH2 is an accurate, pocket-size psychrometer for HVAC technicians. Furthermore, the PRH2 is a handy, stand-alone psychrometer that will quickly measure wet bulb, %RH, dew point, and dry bulb temperature shown on a backlight, dual display. Fieldpiece, the leader in products for HVAC/R professionals, designed this must-have ultra-portable psychrometer. Made for technicians to quickly and easily measure % relative humidity, wet bulb, dew point, and dry bulb.

The psychrometer runs on a single AA battery that lasts up to 100 hours, is simple to use, has a bright backlight, is easy to read in dark areas, and has a slim 2” long tip to take measurements easily inside the ductwork. Perfect for clipping to a pocket for convenient access at any time.


  • (1) Fieldpiece PRH2 Digital Pocket Psychrometer
  • (1) AA Battery


  • Fieldpiece PRH2 Digital Pocket Psychrometer
  • Ultra bright backlight
  • Slim and portable, clip in your pocket
  • 2" long tip for insertion into ductwork
  • Use for walk around testing or in-duct analysis
  • Twist cap protects sensors when not in use
  • Measures Wet bulb, Dry Bulb, Dew point and Relative Humidity temperature quickly and easily
  • Hold, max, min (HOLD, M/m).
  • Runs on a single AA-battery that lasts up to 100 hours


Fieldpiece PRH2 Digital Pocket Psychrometer
Probe size : 2" long, 3/8" tip diameter
Operating environment : 32°F to 104°F (<90% RH)
Storage environment : 14°F to 140°F (<70% RH)
Temperature Range : -40°F to 257°F (-40°C to125°C)
Temperature Resolution : 0.1°F/0.1°C
Temperature Accuracy : ±(0.6°F) 32°F to 140°F ±(2.0°F) <32°F, >140°F
Relative Humidity Range : 0% to 100%RH
Relative Humidity Resolution : 1.0%RH
Relative Humidity Accuracy : ±(3.0%) 20% to 80% ±(5.0%) <20%, >80%
Battery life : 165 hours typical alkaline
Auto-off : 10 minutes
Weight : 3.20 ounces
Material : Plastic
Product Dimensions : .9" x 3" x 2"

Q & A

How do you use the fieldpiece psychrometer prh2?

Press ON/OFF for 3 seconds to power on or off. HI or LO will show if measurement is out of range. Lo bAt is displayed when below operating voltage. Twist bottom chrome cap to change the AA battery. Backlight activates on any button press. Press HOLD/M/m for 1 second to exit mode. Toggle °F and °C with a pin through hole on back. Press HOLD/M/m and ON/OFF together for 3 seconds to disable Auto-Off (APO).

Does the fielpiece prh2 come with a case?

No, it fits in your pocket much like a pen.

What is a digital psychrometer used for?

A psychrometer is a device used to measure the humidity of air. It accomplishes this by comparing the difference in temperature between a dry thermometer bulb and a wet thermometer bulb that has lost some of its moisture through evaporation.

Customer Reviews

Based on 1 review
Sturdy, easy to use

Works great. Stabilizes humidity and temperature in a few seconds.