Thermo Fisher Scientific Eutech 2700 Series - Manual (Page 32)

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Cal Due
When enabled, the “Cal Due” indicator blinks if the
number of days since the last calibration has been
exceeded. Set the number of days from 1 to 31.
Refer to your Ion Selective Electrode instruction manual for
details on conditioning, storage, maintenance, calibration
standard preparation, Ionic Strength Adjustment,
troubleshooting, etc. Each ISE is unique and requires care
and operation that is specific to the electrode and ion of
interest.