variometer

(ver′ē ämət ər, var′-)

noun

  1. any of various devices designed to measure or record small variations in some quantity, as air pressure
  2. a geophysical instrument for measuring magnetic forces or determining variations of magnetic force, esp. at different places on the earth
  3. Electronics 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

Origin: vario(us) + -meter

See variometer in American Heritage Dictionary 4

noun
A variable inductor used to measure variations in terrestrial magnetism.

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