Hanna Instruments HI 3221 Instruction Manual page 33

GENERAL PARAMETER SCREENS
Backlight
Focus on the Backlight item.
Press Modify.
Use / keys to change the intensity then press Accept to confirm.
Press ESC to leave without changing.
Contrast
Focus on the Contrast item.
Press Modify.
Use / keys to change contrast then press Accept to confirm.
Press ESC to leave without changing.
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