| 摘要 |
A device aiding the dispensing of hearing aids which is able to test the perception of hearing and determining correct amplification of the hearing aid, whereby a plug adapted to be received in a client's ear has passing therethrough two tubes, one which carries the output sound from a source, normally a hearing aid programmed to compensate for the client's disability, into the ear and the other which acts as a vent. The device is designed to enable the hearing impaired person to get a truer more and more accurate indication of the sound output of a hearing aid.
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