Nokta detectors Ultra Scanner - Manual (Page 5)

Sensitivity and Signal Level Indicator
► The red LEDs indicate the device's sensitivity level as well as the
signal level when metal is detected in audio mode. You can adjust the
sensitivity based on surrounding conditions and your preference
using the up and down arrow keys. At maximum sensitivity, all red
LEDs will light up and at minimum only a single LED will illuminate.
► As mentioned above, when metal is detected in audio mode the
red LEDs will provide visual warning by lighting up according to the
strength of the signal received from the metal.
Interference Elimination Button
► The device is set for maximum sensitivity for the smallest objects.
This may cause the device to produce signals when held close to a
floor with metal construction. You may enable the device not to
respond to metals under the floor by pressing and holding this button.
When released, the device will go back to its previous sensitivity level.
NOKTA ENGINEERING
OPERATING INSTRUCTIONS
Internal Sensitivity Setting
► Some applications may require different sensitivity setting from the
factory setting. An internal sensitivity setting has been placed under
the rubber handle cover. You can access this setting by pulling back
the rubber and adjust the sensitivity by a screwdriver using a test
object of your choice. The sensitivity will increase as you turn the
setting clockwise and it will decrease when turned counterclockwise.
► Please keep in mind that when the sensitivity is increased the
device may get affected by the surrounding metals and receive noise.
Be sure to check that the sensitivity is at the desired level by testing it
with appropriate targets each time the internal sensitivity setting is
changed. It is recommended that only technicians should change this
setting.