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  • Auditory measuring instruments capable of both air conduction measurements and bone conduction measurements. These devices are typically equipped with earphones and a headband, which provides pure tones of specified frequencies at known sound pressure levels, one ear at a time; they may also be equipped with a bone vibrator. For clinical use, both facilities are required, as well as means of generating calibrated masking noise. An external-input port is usually provided for connection to an external signal source. These devices are used to screen the auditory function of adult and pediatric patients who are capable to cooperate with the measurements.
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