[Specifications] Barometer: measuring range from 300 mbar to 1100 mbar, resolution 0.1 mbar. Electronic compass: 8-azimuth display, external magnetic field correction: accuracy 3, resolution 1 degree Thermometer: range from -10 measure and60 ( optional units), 0.1 degree resolution [For outdoor sports enthusiasts] Provide a wide range of necessary accurate information, suitable for outdoor places such as mountaineering, camping, mountaineering, etc. [Weather Time Forecast] 12-24 hours in advance to predict the weather conditions, 4 types of weather conditions: sunny, semi-clear, cloudy, rainy [8 in 1 multifunctional altimeter] Electronic altimeter (weather forecast and altimeter and compass and barometer and clock and spirit level and calendar), 5 seconds high brightness blue LED backlight [Altimeter range] The measurement range is -700 m to 9000 m (-2300 to 2950 feet) (the altimeter can be calibrated initially), with a resolution of 1 meter or 3 feet