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.Features & Benefits:• 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 batteriesSpecifications:Data update: 300msPower supply: 3 x 1.5V AAA (sold separately)Operating time: Up to 60 hrsWeight (with batteries): 134.5gContents:Handheld Digital Anemometer - Wind Speed and Temperature Meter, 0.4-30m/s and -20-70?