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Altimeter: Accurate to 30,000 feet, diplays you current elevation, shows elevation gain/loss, and records your entire session for later analysis. Simplifying altimeter use, the Suunto Core includes a unique start-from-zero function that eliminates the need for entering a reference altitude. With the single push of a button, the altimeter will begin tracking your ascent and descent. Automatic Alti/Baro switch Lockable logs Altimeter/barometer lock Logbook function Temperature compensation Altitude range -500m - 9000m/-1600ft - 29500ft Automatic 7 day Alti-Baro memory Difference measurement Log graph Resolution 1 m Real-time vertical cumulative value   Barometer: Measures and records air pressure to help you predict changing conditions. Features automatic Altimeter/Barometer mode that senses movement or lack thereof, switching between altimeter and barometer accordingly Weather Trend Indicator shows the barometric history for the last three and six hours... http://suuntostore.info/suunto-ss01331...