Hi all,

Robert my brother Bob thinks the units are of the analog output
and LVDT type sensing.  The tester seems to read resistance
and capacitance which seems to be a "clue" tip off for this
type of sensing.  I'am not into much electronics but I've seen
a generally simple circuit that may have possiblities in this
regard.  Being as they ARE SURPLUS, and OLDER, there may
not be any alternative but to home brew a circuit to utilize such;
especially if GeoTech doesn't stock/maintain specific equipment
(?) or the price is too high at that company (?).  Am not sure
at all, but I am guessing these units are ~ 20-30 years old.

Meredith Lamb

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