Sonometer

n.	1.	(Physiol.) An instrument for exhibiting the transverse vibrations of cords, and ascertaining the relations between musical notes. It consists of a cord stretched by weight along a box, and divided into different lengths at pleasure by a bridge, the place of which is determined by a scale on the face of the box.
	2.	An instrument for testing the hearing capacity.

Noun

1.

sonometer - an instrument used to measure the sensitivity of hearing Synonyms: audiometer

audiometer, measuring device, measuring instrument, measuring system