Altimeter

Not to be confused with attitude indicator.
Diagram showing the face of the "three-pointer" sensitive aircraft altimeter displaying an altitude of 10,180 ft (3,100 m). Reference pressure of about 29.92 inHg (1013 hPa) is showing in the Kollsman window

An altimeter or an altitude meter is an instrument used to measure the altitude of an object above a fixed level.[1] The measurement of altitude is called altimetry, which is related to the term bathymetry, the measurement of depth under water.

  1. ^ Wragg, David W. (1973). A Dictionary of Aviation (1st ed.). Reading: Osprey. p. 33. ISBN 0-85045-163-9.