Fieldpiece PRH2 Pen-style Pocket Digital Psychrometer
For real-time, instant readings techs use everyday, this pocket digital psychrometer is a must have for every HVACR professional.  Wet bulb, dry bulb, dew point, and %RH are shown on the backlight, dual display, and measurements can be taken either in the duct, or while walking around. Helps calculate target superheat.Specifications:Probe size: 2" long, 0.38" diameterTemperature range: -4 to 140 Deg F, 0.1 F resolution, +/- 2% accuracyRelative Humidity: 15-90%, 1.0% RH resolution, +/- 3% accuracy in 30-80% RH range, +/- 5% accuracy <30% RH, >80% RHBattery: 1 AA battery, includedAuto off: 10 minutes