KANOMAX 6501 series Climomaster - Manual (Page 51)

50 Other Settings
Contrast Adjustment
If the LCD display of the CLIMOMASTER is
too dark or too light, there is an
adjustment dial at the back, bottom of the
unit, inside the battery cover.
You can adjust the contrast by using a precision screwdriver (-)
（0.9 to 1.5mm）.
Turn the dial clockwise to darken the LCD and counterclockwise
to lighten it.
Contrast Adjusting Dial
Lightens Darkens