Pressure altimeters are aneroid-capsule-based flight instruments that determine aircraft altitude by measuring static air pressure against a calibrated scale referenced to standard atmosphere (ISA) or a local QNH/QFE setting, encompassing the manufacture of evacuated aneroid wafers, precision gear-and-lever mechanical linkages, Kollsman windows for barometric subscale adjustment, and vibration-dampened aluminium housings qualified to DO-160 environmental standards.
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