Garrett Pro-Pointer Owner's Manual page 15

Pinpointing Large Objects: When locating
large metal objects—whether in the ground or in a
wall—you can improve the pinpointing capability by
"detuning" the PRO-POINTER in order to narrow the
detection field, as follows.
Slowly scan towards the object until the detector's
response increases to the full/constant alarm. Then,
without moving the detector, switch the power off and
then back on again in order to cancel out the target
and narrow the detection field. Now continue scanning
towards the object to find its precise location. Repeat
the power off/on cycle to further narrow the detection
field as needed.
After you have finished, you can return the PRO-
POINTER to its normal detection field by simply
switching the power off and back on while holding it
away from all metal.
Pro-Pointer
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