Features： 1、Using bearings and photoelectric principles, it uses special blades that can withstand high temperatures within 50°C and strong winds below 45 meters. 2、Professional design, its wind wheel diameter is about 6 cm, can measure wind speed efficiently, so as to achieve the accuracy of data measurement. 3、Large LCD screen display, the high definition screen it uses can easily cope with various dark environments, and the data display is clearer, allowing you to easily measure and record the data. 4、Multi function measurement, it can measure and display the maximum wind speed, flow velocity and average wind speed (m/s, ft/min, km/h, mph). 5、With its compact size, it is lightweight and portable, and can be easily hand held to measure in various situations. It is a good helper for you to measure wind conditions. Specification： Item Type: Anemometer Model: 8901 Material: ABS Purpose: It is suitable for flow velocity and wind speed measurement. Air Velocity Unit Range Minimum Resolution Critical Point Accuracy M/s 0~45 0.01 0.3 ±3%±0.1dgts Ft/min 0~8800 1.9 60 ±3%±10dgts Knots 0~88 0.02 0.6 ±3%±0.1dgts Km/hr 0~140 0.03 1 ±3%±0.1dgts Mph 0~100 0.02 0.7 ±3%±0.1dgts Temperature Unit Range Resolution Accuracy ℃ 0℃~+45℃ 0.2 ±2℃ ℉ 32℉~113℉ 0.36 ±3.6℉ Power 1x9V 6F22 Battery (Battery Not Included) Operating Temperature -10℃~+50℃（14℉~122℉） Working Humidity 40%RH~85%RH Storage Temperature -20℃~+60℃（-4℉~140℉） Storage Humidity 10%RH~90%RH Package List： 1 x Anemometer (Battery Not Included) 1 x Wind Speed Sensor 1 x Manual