100' graduations. Ranges: 0 to 15,000'; 20 to 31.5" Hg.Using the included Velcro(R) material, this altimeter/barometer mounts easily to the top or front of a dashboard. An extra set of Velcro(R) attachments is also included, allowing you to move the instrument between vehicles. Measures altitude and barometric pressure. A weather trend indicator predicts fair or stormy weather.