Features: 1.Wind Speed,temperature and humidity measurement. 2.Wind speed unit option: for m/s,ft/min,knots,for km/h,mph-. 3.White backlight screen. 4.Celsius and Fahrenheit unit switch. 5.Max/Min/Average value. 6.Data maintenance function. 7.Wind- chill index prompt.8.Low power battery warning.9.Automatic power off.10.Calibration. Specifications: Main Material: Plastic Model: TL-300 Type: 3 in 1(Thermometer/Hygrometer/Speed Meter) Color: Blue,Red,Black(optional) Wind Speed measurement range: 0.3-30m/s Accuracy: +-5% Temperature Measurement Range: -10 to 50- Degrees Celsius(14 to 122 Fahrenheit) Accuracy: +-1 Degrees Celsius Humidity Measurement Range: 20%- to 90% accuracy: +-5% Resolution ratio: 0.1m/second, 1%,0.1 degrees celsius Operating Temperature: 0 to 50- Degrees Celsius(32 to 122 Fahrenheit) Operating Humidity: 10- to 90%RH Storage Temperature: -10 to 60 Degrees Celsius(14 to 140 Fahrenheit) Storage Humidity: 10 to 75%RH Power Supply: 1 x Battery(Not Included) Size: One Size 11x4.5x4cm/4.33x1.77x1.57in Quantity: 1 Pc Package Includes: 1 x Anemometer note: 1.No retail package. 2.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!