Features:This is a digital anemometer measuring temperature, humidity, dew point temperature, wet bulb temperature, wind speed and air volume. The meter is a portable, professional measuring instrument with large LCD screen and backlight, multi-unit switch function. It can be used for carrying or fixed measurement. This instrument features readings retention, maximum, minimum, etc. It has a low battery indicator and real-time data upload USB function. Specification: Technical Indicator Range Precision Resolution Ratio Wind Speed 0.80~30.0 m/s ±(2.0% reading + 50 ) 0.01m/s 80~5900 ft/m ±(2.0% reading + 50 ) 1ft/m 1.40~108.0 km/h ±(2.0% reading + 50 ) 0.01km/h 0.90~67.20 mile/h ±(2.0% reading + 50 ) 0.01mile/h 0.80~58.30 Knots ±(2.0% reading + 50 ) 0.01knots 1.30~98.50 ft/s ±(2.0% reading + 50 ) 0.01ft/s Wind Flow 0~ 9 9 9 9 0 CFM （Area）0 - 9.999 ft2 0~ 9 9 9 9 0 CMM （Area）0 - 9.999 m2 0 t o 9 9 9 9 CMS （Area）0 - 9.999 m2 Wind Humidity （-14to140°F） 1.5℃（±2.7°F） 0.1℃（±0.1°F） Wind Relative Humidity （20~80）%RH （＜20 or＞80）%RH 3%RH@25℃ 5%RH@25℃ 0.1%RH Feature Data-hold Yes Max/min measurements Yes Auto power-off Yes Backlight Yes USB interface Yes Undervoltage indication Yes General Parameters Power Supply 1x9v 6F22 battery (Not included) Overall Dimensions 16.5*8.5*3.8cm/6.5*3.3*1.5inch Material ABS Weight Approx. 200g/7.1oz Security Level CE RoHS Package List:1* Digital Anemometer 1* CD1* Cable1* Black Bag.