Hanna Instruments HI 98188 Instruction Manual page 39

Contrast
Focus on the Contrast item.
Press Modify.
Use / keys to change contrast then press Accept to confirm.
Press ESC to leave without changing.
Auto Light Off
Focus on the Auto Light Off item.
Press 5, 10 or 30 to change settings.
Press one of the functional key to change the option.
Auto Power Off
Focus on the Auto Power Off item.
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