Audiometers.
D001299:Audiometry / Q000145:classification / Q000191:economics / Q000295:instrumentation* / Q000592:standards; D003201:Computers; D006317:Hearing Loss, Noise-Induced / Q000517:prevention & control; D006320:Hearing Tests; D006801:Humans; D007221:Industry; D008904:Miniaturization; D009784:Occupational Diseases / Q000517:prevention & control