Variometer Definition

Any of various devices designed to measure or record small variations in some quantity, as air pressure.

A geophysical instrument for measuring magnetic forces or determining variations of magnetic force, esp. at different places on the planet earth.

A continuously variable inductor consisting of a coil mounted within and in series with a fixed coil, with the inner coil capable of rotation so as to vary the total inductance.

A rate-of-climb indicator.