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. * Data update: 500ms * Power supply: 3 x 1.5V AAA (sold separately) * Operating time: Up to 50 hrs * Weight (with batteries): 134.5g