6
Sensitivity and Target Elimination
Adjusting Sensitivity
The
left knob
clicks on to power the detector on.
After turning on, the left knob is used to control the detector’s sensitivity level. In
the 100% clockwise position, the detector is at maximum sensitivity. At this
level, the detector will detect a coin-sized object, like a quarter, up to 5” away
from the coil. Very large metal objects will be detected up to one and one-half
feet from the search coil at maximum sensitivity.
Reduce the sensitivity if the detector chatters or emits false signals; your detector
is probably reacting to electromagnetic interference.
Target Elimination
The
right knob
is used to eliminate unwanted metals from detection.
For instance, you may be searching for coins, and want to eliminate objects like
nails, bolts, or pull-tabs from detection.
As you turn the right knob clockwise, you progressively eliminate different types
of metals from detection. As you rotate the right knob, you first eliminate iron
objects from detection. Iron objects include nails, bolts, old cans, and tools.
Next, you eliminate nickels, pull-tabs, and finally zinc pennies.
Gold is also eliminated from detection with the right knob. First smaller gold
objects are eliminated; as you rotate the knob further, larger gold objects are
eliminated. Silver objects, like high-value coins, are not eliminated from
detection.
Refer to this scale for the relative positions at which different types of metals are
eliminated from detection:
