Garrett Metal Detectors Infinium LS - Manual (Page 19)

1
. Reverse Discrimination Technique:
When a target has been discovered while operating
at minimum discrimination, you may use the reverse
discrimination technique to help determine possible
target identification.
A. Once a target is found, increase discrimination to
maximum level (Iron Check).
B. If the target still produces a substantial signal
there is a good chance it is iron. If the target has
disappeared or produces only a faint signal then it's
probably a desirable target and not iron. Be aware,
however, that some small iron may behave like a
desirable target, and some desirable targets such as
large nuggets and coins may behave like iron.
C. As with all PI detectors, eliminating the detection of
iron is difficult if not impossible; however, the reverse
discrimination technique is effective at identifying
most iron. In addition, attaching a magnet to the
inside of your digging tool can help separate bits of
iron and other debris from your treasure finds.
D. Finally, it is important to remember that any detec-
tion signal, no matter how loud or faint,
represents the sound of metal and its source should
always be determined.