DESCRIPTION
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The Model 66 Valve and Box Locator (M-66) offers the utility indus-
try an uncomplicated detector for finding buried metal objects.
This all-metal metal detector can even search through concrete
and asphalt. Please note that the M-66 is a Metal Detector which
should not be a substitute for a Utility Line Tracer. Fisher Research
Laboratory manufactures a complete line of equipment for Line
Tracing.
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M-66 SEARCHING
It is a good idea to establish a methodic search pattern.
Avoid swinging the M-66 like a golf club, swing the detec-
tor side to side keeping the search coil the same distance
above the ground. Your sweep pattern should be a slow,
half-circle motion. If you are searching for a small target,
it is a good idea to overlap your sweeps.
When the detector’s search coil starts to pass over a metal
object, the sound will increase and the meter readings
will increase. Depending upon the size and depth of the
target, the target may appear (respond) to be larger then
it should. To get a visual outline of the target, you need
to reduce the sensitive of the M-66. An easy way to do
that is to raise the coil and pass over the target. This can
help establish the edges of the target.
Another method that will give a visual outline is to reduce
the Tuning Control (sensitivity) of the M-66. Move the
coil away the target. Reduce the Tuning Control (turn
counter-clockwise) approximately ¼ of a turn. Sweep
across the target area. The sound and meter readings
will be more responsive as the search coil passes over the
target. You may need to repeat this step more times if
the target is at a shallow depth. Be aware that you can
loose responsiveness of the target by over reducing the
Tuning Control (sensitivity) of the M-66.
Using headphones (not supplied) improves battery life, and
prevents the sounds from annoying bystanders.
It also allows you to hear subtle changes in the sound more
clearly, particularly if searching in a noisy location. For safety
reasons, do not use headphones near trafc or where
other dangers are present. This device is to be used with
interconnecting cables/headphone cables shorter than three
meters.
USING HEADPHONES
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