This anemometer is portable and useful which can measuring wind speed and temperature, it also can show you wind scale and indicate windchill. LCD display with backlight, it is easy to read value at night.   Features: This portable anemometer is a practical measuring meter which can measure wind speed and temperature.  Wind speed unit is switchable: m/s, km/h, ft/min, knots or mph.  With wind scale and windchill indication.  Temperature unit is switchable: Celsius(°C) or Fahrenheit(°F).  Maximum, minimum and average value measurement function.  LCD display with backlight, easy for reading.  Come with a string, convenient to hold and carry.   Specifications: Wind Speed Range: 0-30m/s; 0-5860ft/min; 0-55knots; 0-90km/h; 0-65mph;  Resolution: 0.1m/s; 19ft/min; 0.2knots; 0.3km/h; 0.2mph;  Temperature Range: -10~45°C; 14~113°F;  Thermometer: NTC Thermometer;  Operating Temperature: -10~45°C;  Relative Humidity: <=90%RH;  Power Supply: 2 * 1.5V AAA Batteries(not included);  Item Size: 16 * 8 * 3.5cm / 6.30 * 3.15 * 1.38in;  Item Weight: 140g / 4.96oz;  Package Size: 18 * 11 * 5cm / 7.09 * 4.33 * 1.97in;  Package Weight: 265g / 9.36oz;   Package List: 1 * Anemometer;  1 * Bag;  1 * User Manual