A very practical instrument that incorporates state-of-the-art microchip technology, and several basic dive instruments into a compact information center. Depth rated to 1082 feet (330 meters). Includes precision digital depth gauge, dive time, and thermometer: displays actual and maximum depth (up to 1082ft), dive time and temperature (water and air). Automatic turn-on and off: it is automatically ready to dive after a self-test Surface interval displayed for 24 hours Logbook for the last nine dives Automatic altitude compensation Variable ascent rates in % and fast ascent warning; variable ascent rate warning (20-66ft/minute) for safer diving. Long battery life for over one thousand 1-hour dives. Temperature (water and air)