n.1.(Mus) A graduated scale for measuring the duration of sounds, and determining their different, and the relation of their intervals.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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Egg shell thickness was determined by gauge thickness ultrasonic (Echometer 1062) [27].
Artie went on to patent an early version of the sonar system of measuring ocean depths, inventing a very early form of sonar called the Echometer, and worked at the Marconi company until his death in 1949 at the age of 62.