For investigating people's ability to hear sounds, their highest audible frequency and their frequency-dependent hearing threshold, using CASSY (
524 013,
524 006,
524 018) or the universal biology measuring instrument (
531 837).
Hearing threshold adapter S contains a sound generator with adjustable frequency and amplitude. The signal is output to a headphone socket. Using the speaker built into the universal biology measuring instrument, the hearing threshold adapter S can also be used b larger groups.
