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Features: Wind speed, temperature and humidity measurements. Wind speed unit selection: m/s, ft/min, knots, km/h, mph. Beaufort scale: Yes. White backlight display: Yes. Celsius/Fahrenheit unit conversion: Yes. Maximum/Minimum/Average reading function. Data hold: Yes. Cold index prompt: Yes. Low battery warning: Yes. Automatic shut-down: Yes. Calibration: Yes. Specifications: Wind speed measurement range: 0.3 to 30 m/s. Accuracy: +- 5%. Temperature measurement range: -10 to 50 Celsius (14 to 122 Fahrenheit). Accuracy: +- 1 degree Celsius. Humidity measurement range: 20% to 99%. Accuracy: +- 5%. Resolution: 0.1m/s, 1%, 0.1 Celsius. Operating temperature: 0 to 50 Celsius (32 to 122 Fahrenheit). Operating humidity: 10 to 90% RH. Storage temperature: -10 to 60 Celsius (14 to 140 Fahrenheit). Storage humidity: 10 to 75% RH. Power supply: 1x CR2032 or LIR2032Button Cell Battery (Not included). Size: 115 x 42 x 19mm. Color: Black or Red or Blue. Package included: 1 x NKTECH NK-W0 Anemometer. 1 x NKTECH TL-1 Screwdriver. 1 x English User Manual. 1 x Bag Holder. 1 x Hand Strip.