Our Digital Psychrometer measures temperature (-20 to 50 °C; accurate to ±1%), relative humidity (0 - 100% rH; accurate to ±3%), and calculates wet bulb, dew point, and enthalpy of moist air (air with humidity). The housing design is useful for in-duct measurement, as well as ambient or vent outlet applications. The magnetic backing allows for hands-free use. The unit features a large, easy to read display and a probe cover which also functions as an extension for taking readings in hard-to-reach places. Requires two CR2032 style batteries (included).