Sonotone Model AB-2 Hearing Aid Battery Tester
The Sonotone Model AB-2 hearing aid battery tester was made by/for
Sonotone Corporation of Elmsford, NY around 1947.
This meter measured 2˝" x 2" x 1⅛" (6.3 x 5.1 x
2.8 cm) and weighed 3.8 oz. (108 g).
The Sonotone Model AD-2 hearing aid battery tester was designed to
test the the large external "A" and "B" hearing aid batteries in use at
that time.
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Front view of the Sonotone Model AB-2 hearing aid battery
tester showing the meter and name plate. The meter had two scales. The
upper one was for measuring the voltage of 45, 30 and 22˝ volt "B"
batteries. The lower scale was for measuring the voltage of the 1˝
volt "A" batteries. Here's how to read the meter. An "A" battery was
good if the needle was in or to the right of the dark blue band on
the lower scale. A "B" battery was good if it was in or to the right
of it's appropriate colored band on the upper scale. The green band was
for 22˝ volt batteries, the red band for 30 volt batteries and the
yellow band for 45 volt batteries.
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The Sonotone Model AB-2 hearing aid battery tester came with two sets of
battery probes. They plugged into the bottom of the meter and the probes
plugged into the holes in the "A" or "B" batteries. The three-wire "B"
battery probe is shown with its black, red and green probes.
The two-wire "A" battery probe is missing. |
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View of the Sonotone Model AB-2 hearing aid battery tester showing the
name plate giving the manufacturer (Sonotone) and the Model number
(AB-2). On the bottom, it shows that the "A" battery prongs were to
the left and the "B" battery prongs to the right.
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Close-up of the bottom of the Sonotone Model AB-2 hearing
aid battery tester showing the plug connections. The two prongs on the
left were where you plugged in the "A" battery jack, while the three
prongs on the right were for the "B" battery jack. |
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Close-up of the bottom of the Sonotone Model AB-2 hearing
aid battery tester showing how the three-holed "B" battery jack (left)
plugged into the 3 prongs of the "B" battery plug (right).
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View of the back of the Sonotone Model AB-2 hearing
aid battery tester showing the instructions on how to read the meter.
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View of the Sonotone Model AB-2 hearing aid battery tester in its
original box.
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View of the outside of the original box of the Sonotone Model AB-2 hearing aid
battery tester. Note the name "Sonotone in the bottom right corner.
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