Hanna Instruments HI 98180 - Manual (Page 42)

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Press Modify to set custom buffer value.
Use ARROW keys to change the value.
Press Accept to confirm custom buffer value or ESC to exit without saving.
View Calibration Points
Focus on the Calibration Point item.
Press the displayed functional key to change option.
If option is enabled the calibration buffers corresponding to the last calibration
are displayed in the pH measurement screen.
Out of Cal-Range Warning
Focus on the Out of Cal-Range Warning item.
Press the displayed functional key in order to change option.
If enabled, the “Out Cal Range” message will be displayed if the pH reading
is not within the calibration range.