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Altimeter hand refractometer diagram und ist eine wertvolle InvestitionAltimeter 8 in 1 Function: Digital altimeter, with digital barometer, digital compass, weather forecast, time, calendar, thermometer, and backlight The device is based on the technology of electronic bearing sensor and barometric sensor The digital altimeter is designed for outdoor use, the detachable string makes the digital compass a perfect hand carry device for various outdoor activates it will give you backlight when you press any button in any