This high-precision digital anemometer can help you measure Air Velocity (wind speed) whether you re flying planes drones helicopters. It s very useful and widely used in hiking sailing pilot ventilation system etc. Features: USB connect with computer for real time data uploading functions. Precisely measuring and it can store up to 50 000 groups of data. This meter is a digital anemometer for measuring wind temperature humidity wind speed and air volume. Professional measuring instrument with large LCD screen and backlight multi-unit switching functions. Wind speed unit is switchable: m/s km/h mil/h ft/m ft/s or knots. Area unit is switchable: m2 ft2. Temperature unit is switchable: Celsius(°C) or Fahrenheit(°F). Air volume unit is switchable: CMS CMM CFM. This meter has functions of reading hold maximum minimum etc. It has a low battery indicator. Specifications: Material: ABS+TPE m/s(meter per second): 0.80 ~ 30.00 ±(2.0% reading+50 characters) ft/m(feet per minute): 78 ~ 5900 ±(2.0% reading+5 characters) ft/s( feet per second): 1.30 ~ 98.50 ±(2.0% reading+50 characters) km/h(kilometer per hour): 1.40 ~ 108.00 ±(2.0% reading+50 characters) mil/h(miles per hour): 0.90 ~ 67.20 ±(2.0% reading+5 characters) Knots(nautical miles per hour): 0.8 ~ 58.30 ±(2.0% reading+50 characters) Air Temperature: -10 ~ 60°C ±1.5°C/-14 ~ 140°F ±2.7°F Air Relative Humidity: (20 ~ 80)%RH ±3%RH@25°C/(80)%RH ±5%RH@25°C Resolution: 0.01m/s; 1ft/m; 0.01knots; 0.01km/h; 0.01ft/s 0.1°C/0.1°F 0.1%RH CFM: 0 to 99990/0 to 9.999ft2 CMM: 0 to 99990/0 to 9.999ft2 CMS: 0 to 9999/0 to 9.999m2 Work Height: Maximum 2000m Work Mode: Frequency of wind speed conversion Display: LCD Maximum Show Value: 9999 Sampling Time: About 0.4s/time Area Setting: Yes MAX/MIN Function: Yes Display Back Light: Yes Auto Off: Yes °C/°F Selection: Yes Ambient Dew Point & Wet Bulb Temperature Selection: Yes Low Battery Indication: Yes USB Interface: Yes Supply: 1 * 9V 6F22 Battery (NOT Included) Operation Environment: 0°C ~ 40°C 0 ~ 85%RH(no moisture condensation) Detector (fan) Operation Environment: -20°C ~ 80°C 0 ~ 95%RH(no moisture condensation) Storage Environment: -10°C~50°C 0~80%RH(no moisture condensation) Item Size: Approx. 16.5 * 8.5 * 3.8cm / 6.5 * 3.4 * 1.5in Item Weight: Approx. 153g / 5.42oz Package Weight: Approx. 354g / 12.47oz Package Size: Approx. 19 * 11 * 6.5cm / 7.5 * 4.4 * 2.6in Package List: 1 * Multifunction Digital Anemometer 1 * Portable Bag 1 * CD 1 * USB Cable 1 * User Manual(English)