The Fieldpiece PRH2 Pocket-Size Pen-Style Digital Psychrometer allows for incredibly fast and accurate everyday psychometrics for HVACR professionals. Wet bulb, dry bulb, dew point, and relative humidity measurements can all be quickly obtained. The dual-display offers a backlit screen for use in poorly-lit areas. Measurements can be taken either in the duct or while walking around. The narrow tip offers easy insertion into ductwork and the twist cap protects the sensors when not actively in use.