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Take a
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CORROSION TOPICS page. Lots
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Midland Tr. Grid-Dip Meter Model 23-120 Transistorized
dip meter with a 0.5 to 150 MHz range, using 6 plug-in coils. Identical
to the THORO-TEST GDM-3.
Made in Japan.
The Monarch
GDM-1
is another version of the "Midland Tr". Both obviously made by the same
manufacturer.
The Quemont Electronics
GDM-3
transistorized
dip meter with a range of 0.5 to
150 MHz, using 6 plug-in coils.
The unit is identical to the
Midland /Thoro-Test
Series
The
Tech model TE-15 is a later model of the
Midland/THORO-TEST
series of GDOs.
It features a three transistor circuit over the
one transistor of the original series. Looks practically identical.
Click for large picture.
THORO-TEST
GDM-3 Ttransistorized
dip meter with a range of 0.5 to
150 MHz, using 6 plug-in coils.
Identical to the
Midland...
or perhaps the Midland is
identical to it! Made in Japan,
before MC became MHz.
.
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