High Gear Altitech Altimeter Watch Digital Altimeter Measures in 1 ft. (1m) increments with a working range from -2,296 feet (-700 m) to 29,500 feet (9,000 m). Stores 20 altimeter data readings with altitude, time, and date. User options for feet or meters. Read in 1 ft. (1 m) increments. Measures in 1 ft. (1m) increments with a working range from -2,296 feet (-700 m) to 29,500 feet (9,000 m). Stores 20 altimeter data readings with altitude, time, and date. User options for feet or meters. Read in 1 ft. (1 m) increments.