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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 |
Mallory Model TR-100 Hearing Aid Battery Tester
The Mallory Model TR-100 hearing aid battery tester was made by/for
the Mallory Battery Company of Cleveland, OH around 1950.
It was quite a large meter, measuring 6¼" x 3¾" x 2⅝" (15.8 x 9.6 x
6.7 cm) and weighed a hefty 1 pound 2.6 oz. (528 g)
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Click picture for larger view |
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Front view of the Mallory Model TR-100 hearing aid battery tester. You
could use the red and black probes for testing the battery, or lay the
meter down and place the negative terminal of the battery on the
"button" (lower left corner) and then just use the red probe for the
positive terminal.
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Click picture for larger view |
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Close-up of the meter of the Mallory Model TR-100 hearing aid battery
tester. The meter had three scales, each color-coded to the colors on
the switch—the red (A) scale (0-3 volts) for "A" batteries, the blue (B)
scale (0-9 volts) for 9-volt batteries, and the green (C) scale
(0-30 volts) for 15, 22½ and 30 volt "B" batteries. |
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Click picture for larger view |
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Close-up of the bottom front of the Mallory Model TR-100 hearing aid
battery tester showing the three position switch and the color-coded A,
B and C ranges.
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Click picture for larger view |
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