Sonotone Model AB-4 Battery Tester
This Sonotone battery meter was made by the Sonotone Corporation of
Elmsford, NY.
It was used for testing the voltages of "A" and "B" batteries
of one-piece hearing aids that were produced around 1949.
The 3 probes were color-coded for ease of use. When testing
batteries, you held the black probe is the negative side of the battery,
and touched one of the other probes to the positive side. The red probe
was for testing "B" batteries and the green probe for testing "A"
batteries.
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Close-up of the meter showing the two scales. The upper scale ranged
from 0 - 50 volts and was for testing the higher-voltage "B" batteries.
The lower scale ranged from 0 - 2 volts and was for testing 1.4 and 1˝
volt "A" batteries.
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