Hanna Instruments HI98165 Instruction Manual page 33

Out of Calibration Range Warning
Highlight Out of Cal. Range Warning.
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 outside.
Approximately 1 pH unit, from the lowest and highest pH buffer value used for calibration. For
single point calibration the message will be displayed for pH values less than 4 or greater than 10.
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