Garrett Metal Detectors Sea Hunter Mark II None - Manual (Page 10)

target discrimination. The background
audio threshold remains at the chosen
level until the searchcoil passes over
targets in the knob's "accept" range,
at which time a sharp audio response,
a characteristic of all motion detectors,
occurs.
Figure 2 shows the typical detection
responses from various metals in both
Discrete (DIS) and Standard (Std) Trash
Elimination modes. Note that in Std 0
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Figure 2