Sterling A/B Battery Meter (Hearing Aid Tester)
This dual-scale battery meter carries the Sterling name. It was one
type of battery tester used in the mid to late 1940s to test both A and B
batteries.
There were a number of battery meters that looked similar except for
the company name on them. It appears one battery meter company designed
the original meter and then manufactured and branded it for the various
hearing aid companies that wanted one.
Normally (by convention) you touched the one tip of the probe to the
positive terminal of the battery, and touched the "foot" (7-o'clock
position) or the "knob" (12 o'clock position) to the negative terminal
of the battery.
Notice that the probe tips are labeled "A" and "B". When you were
testing an "A" battery, you used the "A" tip which was connected to the
2 volt range. Similarly, to test a "B" battery you used the "B" tip
which was connected to the 50-volt range.
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