Hugh Hetherington Hearing Aid Museum
Hugh Hetherington Hearing Aid Museum

The Hearing Aid Museum

Hearing Aids of all types—Ear Trumpets, Carbon Hearing Aids, Vacuum Tube Hearing Aids, Transistor Hearing Aids, Body Hearing Aids, Eyeglass Hearing Aids and much more!

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Hearing Aid Battery Testers

Hal-Hen No. 15 Transistor Type Battery Tester

This 3 volt battery tester carried the Hal-Hen name. It came out when the transistor hearing aids became available beginning in 1953.

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This meter was for testing mercury batteries for transistor hearing aids. Most mercury batteries were 1.4 volts, hence the red line at that point, or less commonly 2.8 volts, and the red line there as well.



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