professional sports digital altimeter measurement solution :1m weather forecast climbing speed measurement CE/ROHS professional sports digital altimeterTitanium matal casebarometerthermometerweather forecastrelative height measurementrecord the highest and lowest altitude automaticallyaltitude alarmrecord the total height automaticallyclimbing speed measurementmetric version and imperial version alternativecalender / timealarm / chronometer / timerEL backlight30M waterproof
