This high-precision digital anemometer can help you measure Air Velocity (wind speed) whether you're flying RC planes, drones, wings, helicopters. It's very useful and widely used in hiking, sailing, drone 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 the 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 the 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 plusmn;(2.0% reading+50 characters) ft/m(feet per minute): 78 ~ 5900 plusmn;(2.0% reading+5 characters) ft/s( feet per second): 1.30 ~ 98.50 plusmn;(2.0% reading+50 characters) km/h(kilometer per hour): 1.40 ~ 108.00 plusmn;(2.0% reading+50 characters) mil/h(miles per hour): 0.90 ~ 67.20 plusmn;(2.0% reading+5 characters) Knots(nautical miles per hour): 0.8 ~ 58.30 plusmn;(2.0% reading+50 characters) Air Temperature: -10 ~ 60 C plusmn;1.5 C/-14 ~ 140 F plusmn;2.7 F Air Relative Humidity: (20 ~ 80)%RH plusmn;3%RH@25 C/( lt;20 or gt;80)%RH plusmn;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 Flow Area Setting: Yes MAX/MIN Function: Yes Display Back Light: Yes Auto Power Off: Yes C/ F Selection: Yes Ambient, Dew Point Wet Bulb Temperature Selection: Yes Low Battery Indication: Yes USB Interface: Yes Power 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)