KANOMAX 2211 Handheld IAQ Monitor - Manual (Page 42)

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7.4 Contrast Adjustment
In case you find the LCD display of Main Body too dark or too light, there is
an adjusting volume at the back, bottom of Main Body, inside the battery
cover.
You can adjust by using a precision driver (-) （0.9～1.5mm）.
Turn it clockwise to darken and vice versa.
Contrast Adjuster
High Low