Highgear ATF8 Handheld Altimeter Functions Include: Altimeter, Barometer, Digital Compass, Thermometer Swiss Altimeter Sensor / 3 Altimeter Presets Altimeter Details: Range -702 to +9158m/-2305 to +30,045ft Barometer: Sea Level Pressure and Absolute Pressure Display Digital Compass: 360Degrees /16 Cardinal Point Bearings