Eveready Model FP-4 Hearing Aid Battery Tester
The Eveready Model FP-4 hearing aid battery tester was made around
1970. It was made for the Union Carbide Corporation of New York, NY.
It was designed to just test mercury and silver button batteries for hearing aids made
in the 1960s and 1970s.
The Eveready Model FP-4 hearing aid battery tester measured 4" x 2⅞"
x 2⅛" (9.6 x 7.3 x 5.5 cm) and weighed 7 oz. (198 g).
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Front view of the Eveready Model FP-4 hearing aid battery tester.
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Close-up of the meter of the Eveready Model FP-4 hearing aid battery
tester. 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. The top range was for testing silver (1.5 volt) batteries,
and the lower range was for testing mercury (1.4 volt) batteries.
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Front view of the Eveready Model FP-4 hearing aid battery tester looking
down into the bottom of the meter. The model number (FP-4) is shown in the bottom
right corner of
the meter. The model number is also on the bottom left corner on the
back of the battery tester.
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Close-up of the bottom front of the Eveready Model FP-4 hearing aid
battery tester showing the two kinds of batteries this meter could test.
With the red switch in the left position (shown) you could test 1.5
volt silver oxide button batteries. With it in the right position, it
could test 1.4 volt mercury button batteries.
To make it easy to test button batteries you could set the battery on
the metallic plate (left) and just use the black probe on the top
(negative) terminal.
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Top rear view of the Eveready Model FP-4 hearing aid battery tester
showing the model numbers of the various Eveready batteries this meter
could test.
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Close-up of the bottom rear of the Eveready Model E-4 hearing aid
battery tester showing the instructions for testing button batteries.
The bottom shows the manufacturer's information.
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