An electromechanical transducer intended to produce the sensation of hearing by vibrating the cranial bones. It can be used as an output device with an audiometer to measure bone-conduction hearing thresholds, and thus serve as an adjunct to air-conduction testing with conventional earphones. Comparison of the results enables the clinician to distinguish hearing loss attributable to the external or middle ear (conductive loss) from the inner ear (sensory loss). In addition, this device may be used to provide output for a hearing aid for patients who cannot wear an earmould.