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An altimeter is an instrument used to measure altitude, or the height above a reference point, typically sea level. It operates by measuring atmospheric pressure; as altitude increases, air pressure decreases. Altimeters are commonly used in aviation, hiking, and various outdoor activities to help determine elevation and ensure safety. There are two main types: barometric altimeters, which rely on pressure changes, and GPS altimeters, which use satellite signals to calculate position and height.

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3w ago

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