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Floors are counted using an altimeter. An altimeter is a sensor that calculates altitude based on atmospheric pressure and atmospheric pressure decreases with increasing elevation, so the it calculates elevation gain based on the reduction in atmospheric pressure. Your trackers register a floor when they detect continuous motion combined with an elevation gain of about 10 feet. Given the fact that 10 feet is an average between residential and commercial floor heights, although commercial floors in particular tend to be higher than residential floors.
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