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Winter Instruments manufactures precision flight instruments. Formed in 1931, today they still produce top quality flight instruments relying on 3 key factors: Experience, Qualification, and Quality management. They offer instruments in 80mm (3.125″) and 57mm (2.25″). Units can be in feet or meters. Altimeters measure static air pressure, which decreases with altitude. The pressure–sensitive measuring element is a diaphragm capsule from which the air has been removed (aneroid capsule), which reacts to the effect of changing air pressure as the aircraft changes altitude. Tempered, aged copper–beryllium diaphragms ensure highly accurate readings. Diaphragm movement is transmitted to the instrument pointers by a linkage and gearwheels – the whole is insensitive to shock and vibration. A bimetal link compensates the effects of temperature change.