Digi-Sense Traceable Micro-Anemometer/Thermometer This compact anemometer measures air velocity in five user selectable values: meters per second, feet per second, miles per hour, kilometers per hour, and knots with a simple one-button operation. It also allows you to measure maximum airflow, temperature (in °F and °C), and wind chill temperature with readings updated 2 times per second. The tough ABS plastic housing and water-resistant construction keeps out moisture, dust, and dirt in harsh indoor or outdoor environments. A high-contrast, backlit LCD with 3/8” digits makes it easy to read even in total darkness. Get accurate, reliable measurements with included NIST-traceable calibrationRugged ABS plastic housingEasy to read backlit display Item number 37955-50 includes lanyard, nylon carrying case, long-life lithium battery, and NIST-traceable calibration certificate. Specifications Min/Max Air Velocity (ft/min) 0/5880 Air Velocity Resolution 0.1 ft/s (0.1 m/s) Air Velocity Accuracy ±5% full scale Min/Max Temperature -20/80 °C (-4/176 °F) Temperature Accuracy ±1 °C Temperature Resolution 0.1° Dimensions (L x W x H) 4 x 1.75 x 0.625 in.