Grason-Stadler Inc. (GSI) is a world leader in audiometric, tympano metric, and evoked potential instruments. GSI has a full line of audiological equipment including audiometers, tympanometers, otoacoustic emissions (OAE) instruments, and our latest introduction--the Audera™, a combination auditory steady-state response (ASSR) and auditory evoked potential (AEP) unit. From school screenings to research facilities, GSI instruments have been used for over 50 years for audiological assessments throughout the world.

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