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Close-up of the meter of the Eveready Model E-4 hearing aid battery
tester. The model number (E-4) is shown in the bottom left corner of
the meter.
The meter was easy to read. If the needle remained in the red, the
battery needed to be replaced. If it was in the green, the battery was
still good.
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Close-up of the bottom front of the Eveready Model E-4 hearing aid
battery tester showing the kinds of batteries this meter could test.
To make things easy the batteries were grouped by type (Mini-max were
carbon zinc "B" batteries for vacuum-tube hearing aids) Silver oxide
(and 1˝ volt carbon-zinc batteries) and Mercury batteries of all sizes.
For each position of the switch, the voltage of the battery is shown
(as well as some examples of batteries of this type).
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