This handheld digital hydrometer has a built-in high precision sensor and has been designed for the measurement of humidity and temperature. It provides rapid, accurate readings displayed on an easy-to-read backlit LCD dual display. The device features data hold, min/max and auto power off. The ergonomic design is highly portable and pocket-sized. There is a low battery indicator. Requires 3x AAA batteries.Features & Benefits:• Backlit LCD dual display• Built-in high precision sensor• Measures relative humidity, dew point and wet bulb temperature• Air temperature selector - ? or °F• Features data hold, min/max and auto power off• Low battery indicator• Requires 3x AAA batteriesSpecifications:Data update: 500msPower supply: 3 x 1.5V AAA (sold separately)Operating time: Up to 50 hrsWeight (with batteries): 134.5gContents:1 x Handheld Digital Hygrometer - Humidity and Temperature Meter, 45-75% RH and -20-70?