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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Click on the "General Information" button (top button above) for an overview and general information on this category of hearing aid.

 

Hearing Aid Battery Testers

Leader (Ammeter) Battery Tester

The Leader ammeter battery tester was made in the USA around 1945.

It measured 2" in diameter by ⅝" thick (5.1 x 1.7 cm) and weighed  1.8 oz. (52 g).

The positive prong (bottom) was fixed to the battery tester, while the negative probe was on a short wire.

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Close-up view of the meter of the Leader ammeter battery tester.

The meter had one scale that read up to 35 amperes. This was more than enough to test the "A" and "B" batteries used in hearing aids in the early 1940s through the early 1950s.
 

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Close-up of the positive prong of the Leader ammeter battery tester.

 

 

 

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Close-up showing how the negative probe attaches to the case of the Leader ammeter battery tester.

To test a battery's amperage, you touched the positive prong to the positive terminal of the battery, and touched the negative lead (bottom) to the negative terminal of the battery.

 

 


 

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