Winter GmbH & Co. KG 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.