Question

What is an altimeter​

Answer 1

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

Answer 2

Answer:

An altimeter is an active instrument used to measure the altitude of an object above a fixed level. ... The altimeter is calibrated to show the pressure directly as altitudes, in accordance with a mathematical model defined by the International Standard Atmosphere (ISA).