Thermo Fisher Scientific Eutech 2700 Series - Manual (Page 30)

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Before and after a manual calibration
5) For multi-point calibration repeat with additional standards. Press ESC to
save calibration or press NEXT to view the calibration report. Calibrate one
point per range, up to 5 points.
Additional manual calibration notes:
A maximum of one calibration point per range can be performed. If multiple
calibration points are used in the same range, the most recent one will replace
the previous one.
When the electrode is replaced, it is best to clear the calibration to the factory
default values.
Rinse or immerse the probe before calibration and between samples with clean
water (deionized water is ideal).
To protect from erroneous calibrations, the allowable tolerance is ±40% of the
factory default value.
For best results always begin with your lowest calibration standard value,
followed by the next lowest, and so on.
Low conductivity standard solutions (less than 20 µS) are unstable and are very
temperature dependent. As a result, reproducible calibration results are
challenging in lowest measurement range #1 (0.00 to 20.0 µS).
Note: If using the 2-cell electrode, the protective probe guard
can be removed temporarily for cleaning however it must be
re-attached during measurement and calibration. Erroneous
results will occur while the probe guard is removed.