Fisher Labs CZ-21 QuickSilver Operating Manual page 34

FALSE SIGNALS
11. Practice! Practice over known targets. Practice
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to your original direction, you'll receive a single beep
directly over the target.
a) Shallow coins (at or near the surface) or coins
on edge will give a double beep: one on either
side of the coin, just like a nail. Like the nail, the
coin on edge will give a single beep directly
over the target if you sweep at right angles to
your original position.
b) A coin lying in the ground at an angle (as
shown) may give a single target response but
may pinpoint several inches away from its true
location. Check around the inside edges of the
hole. If you still don't find it, enlarge the hole by
a couple of inches.
c) A large, deep target, like a buried pipe or a
manhole cover at 2 feet, will often give a good,
strong coin signal. If you've dug down a foot
and widened your hole several times, give up.
ground balancing. Practice pinpointing. Reread
the appropriate part of this manual if you're having
problems.