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an instrument for testing the intensity and frequency range of sound that is capable of detection by the human ear
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
An instrument composed of an oscillator, amplifier, and attenuator and used to measure hearing acuity for pure tones, speech, and bone conduction.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.