Garrett AT Pro Owner's Manual page 23

Example: Manual Modification of Notch Discrimination Pattern
Use the NOTCH DISC buttons to position the Target ID Cursor above the pixel
you wish to eliminate (see above illustration). Use the ELIM pushbutton to
delete this pixel from the Lower Scale (see below). This item is now rejected.
The second method of modifying the Notch Discrimination
pattern involves the use of only the ELIM pushbutton. When
an unwanted target is audibly detected while hunting, simply
push the ELIM button to create a notch at that Target ID
Cursor. The next time the AT Pro encounters the same trash
item, it will not produce an audible signal.
The AT Pro's ELIM pushbutton can also be used to find
specific metal items. For example, if an earring has been
lost, scan the matching earring with the AT Pro while in the
ZERO mode. Note where the Target ID cursor appears when
the earring is scanned. Next, use the NOTCH DISC and ELIM
pushbuttons to switch off all the pixels except the one for the
earring.
Note: Depending upon how the lost earring is laying in the
ground, its Target ID may shift a little; therefore, your ability
to find it will be enhanced by turning on an additional pixel
AT Pro International™
23