This handy altimeter + barometer mounts in seconds to windshield or top of dashboard. Altitude in FEET. Levered suction cup plus sticky pad hold tight. Altimeter is held in place by 4 magnets, but is instantly removable for toting in pack or pocket. Altitude range: 0 to 15,000 ft. Analog design; battery free. Includes Weather Trend indicator. Measures barometric pressure in inches of mercury.