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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. |
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Hearing Aid Battery Testers |
Sonotone (Lamp) Battery Tester
This Sonotone (lamp) battery tester was designed to test Sonotone 3 volt and 4˝
volt batteries commonly used in carbon hearing aids made in the 1920s
and 1930s.
To use it, you plugged it into the battery in question. Some of the batteries in
those days had pin sockets. For example, the
Sonotone X65
was one such battery.
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Click picture for larger view |
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Close up of the Sonotone battery tester showing the light on the top.
The brighter the light shone, the better the charge in the battery. If the
lamp glowed brightly, the battery was good, if it glowed dimly, the
battery was just about worn out, and if it didn't glow at all, the
battery was dead.
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Click picture for larger view |
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The original box of the Sonotone (lamp) battery tester.
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