Garrett Ace 350 Owner's Manual page 17

Accept/Reject Pushbutton

(Use in conjunction with the DISCRIM
pushbuttons to modify the discrimination pattern.)
Press the Accept/Reject pushbutton to eliminate or activate
pixels located on the Lower Scale, directly below the Target
ID cursor.
As seen in the illustration below, the ACE 350 has 12 pixels
or "notches" of discrimination. Any combination of these
pixels can be switched on or off based upon your preference.
There are two primary methods for modifying the Notch
Discrmination Pattern to reject a specific type of trash or
unwanted item while detecting all other metal.
The example below illustrates how to manually use both
the DISCRIM and Accept/Reject pushbuttons to modify the
Notch Discrimination pattern.
Use the DISCRIM buttons to position the Target ID Cursor above the pixel you
wish to eliminate (see above illustration). Use the Accept/Reject pushbutton
(/X) to delete this pixel from the Lower Scale (see below). This item is now
rejected.
16 Garrett Metal Detectors