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: This meter is a portable, professional measuring instrument with large-screen LCD and backlight, multi-unit switching functions. It is used for wind speed measurement, area setting and air volume measurement. Wind speed unit is switchable: m/s, km/h, mil/h, ft/m, ft/s or knots. Area unit is switchable: m2, ft2. Air volume unit is switchable: CMS, CMM, CFM. This meter has the functions of reading hold, maximum, minimum, etc. 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) Resolution: 0.01m/s; 1ft/m; 0.01knots; 0.01km/h; 0.01ft/s 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 MAX/MIN Function: Yes Display Back Light: Yes Auto Power Off: Yes Power Supply: 1 * 9V 6F22 battery(NOT Included) Operation Environment: 0C~40C, 0~85%RH(no moisture condensation) Detector (fan) Operation Environment: -20C~80C, 0~95%RH(no moisture condensation) Storage Environment: -10C~50C, 0~80%RH(no moisture condensation) Item Size: Approx. 16.5 * 8.5 * 3.8cm / 6.5 * 3.4 * 1.5in Item Weight: Approx. 151g / 5.32oz Package Weight: Approx. 277g / 9.79oz Package Size: Approx. 19 * 11 * 6.5cm / 7.5 * 4.4 * 2.6in Package List: 1 * Multifunction Digital Anemometer 1 * Portable Bag 1 * User Manual(English)