tone-testern. an instrument for determining the differential sensibility for (musical) tones.
ΘΚΠ
the world > physical sensation > hearing and noise > type or quality of hearing > [noun] > instrument for determining sensibility
tone-tester1893
1893 Yale Psychol. Studies 81 The instrument used in making the experiments was composed of an adjustable pitchpipe with an index-arm moving over a large scale. The instrument..may for brevity be called the tone-tester.