Hanna Instruments HI 98188 - Manual (Page 39)

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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.