White’s Electronics Matrix 100 - Color - Manual (Page 13)

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De-Sense button
On the top edge of the scanner, there is a large rubber “De-sense” button.When
depressed, this button will reduce the detectors sensitivity by approximately
50%. This is particularly useful when scanning near rebar reinforced floors.
The “De-sense” is only activated as long as the button is depressed. While
the “De-sense” button is pressed the ON/OFF LED (see Page 4) will illuminate
continuously. If the battery is good, the LED will be green. If the battery is low
or defective the LED will be yellow.
Visual indicator LED
De-sense button