This is a professional digital anemometer with stable performance, safety and reliability. It is widely used in wind energy, meteorology, industry, agriculture, hydrology and water conservancy, environmental protection, highways, airports and ports, etc Features: 3-in-1 Multifunction Anemometer: with stable performance and reliable quality, the professional digital anemometer not only can measure wind speed, but also can measure temperature & humidity. High Accuracy Measurement: wind speed meter can accurately measure wind speed in 6 units: m/s, km/h, mil/h, ft/m ft/s, knots. Range 0.7-30m/s, 2.5-108km/h, 2.3-98.5ft/s, 137-5900ft/m, 1.3-58.3knots, 1.5-67.1mil/h. More Features of Anemometer: data hold function, can hold the reading; MAX/MIN function, it will show the highest/lowest reading on the display; manual / auto power OFF optional; low battery indication. Handheld LCD Screen Meter: this wind speed gauge equipped a LCD screen with backlight, can reading better and clearer both under sun or in dark. Compact and lightweight, you can keep it in pocket. Wide Applications: it is widely used in wind energy, meteorology, industry, agriculture, hydrology, highways, airports, etc. Specifications: Material: ABS Air Velocity Unit: m/s, km/h, mil/h, ft/m, ft/s, knots Air Velocity Range: 0.7-30m/s, 2.5-108km/h, 2.3-98.5ft/s, 137-5900ft/m, 1.3-58.3knots, 1.5-67.1mil/h Temperature Range: -20~60(-4~140) Humidity Range: 0~100%RH Beaufort Scale: 0-12 Display: LCD with backlight, MAX display 9999 Air Velocity: 0.70-30.00m/s Sampling Rate: One reading per 0.5 sec. Sensor: Air velocity/flow sensor-angled vane arms with bearing Max/Min: Minimum, maximum measurement Data Hold: Freeze reading Operating Environment: Temp. 0-40C, humidity