This handheld digital anemometer has a built-in rotating wind vane and has been designed for the measurement of air velocity 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. Backlit LCD dual display Built-in rotating wind vane Wind unit selector - m/s, km/h, ft/min, mph and knots Air temperature selector - ℃ or °F Features data hold, min/max and auto power off Low battery indicator Requires 3x AAA batteries Data update: 300ms Power supply: 3 x 1.5V AAA (sold separately) Operating time: Up to 60 hrs Weight (with batteries): 134.5g