Garrett Metal Detectors Metal Detector GTI 1500 - Manual (Page 51)

BENCH TESTING
This will enable you to test typical targets
and to learn about the discriminating
capabilities of the GTI before taking it into
the field or trying to set discrimination.
The following tests should be performed,
as shown above with the searchcoil per-
pendicular to a bench, floor or other non-
metallic surface and several feet away
from any metallic object:
1. Select the Zero mode of operation.
Bring various metallic targets across the
center of the bottom of the searchcoil at a
distance of about two inches. Each target
Graphic Target Imaging 1500 - 51