Hanna Instruments HI 98180 - Manual (Page 30)

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Wrong slope
The calibration cannot be confirmed.
This message is displayed if slope is out of the accepted range.
Slope under accepted value (30 % default slope).
Slope over accepted value (130 % default slope).
Wrong old slope
An inconsistency between new and previous (old) calibration is detected. Clear
old calibration parameters and proceed calibration from the current point. The
instrument will keep all confirmed values during current calibration.
The instrument will display “----” on the primary LCD if is not calibrated or
after all calibrations are cleared.
If “Clear” is pressed during the first calibration point, the instrument returns
to measurement mode.
Notes: •Press T functional keys or MODE to select temperature value to be
changed if the temperature probe is not connected.
•ISE range is not temperature compensated