Thermo Fisher Scientific Eutech PC 700 - Manual (Page 12)

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Use Multi-Point Calibration for individual calibration in each range. This
will restrict an individual calibration so that it is applied to one range
only. When using multi-point calibration, perform a calibration in each
range that you expect to use for best results.
The factory default is Single-Point Calibration. See Section 9.12 to
change this setting.
5.3 General Calibration Tips
For best results, periodic calibration with known accurate standards is
recommended. 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 (see Section 9.14).
Rinse or immerse the probe before calibration and between samples
with clean water (deionized water is ideal).
The PC 700 has non-volatile memory which will retain all calibration
values, as well as meter settings and memory values upon meter shut
down or unexpected power loss.
To protect from erroneous calibrations, the allowable tolerance is ±40%
of the factory default value.
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).
5.4 Automatic Conductivity Calibration Procedure
1) Press as needed to select conductivity (μS or mS).
2) Dip the electrode into the conductivity standard and press .
Provide stirring for best results.
3) The primary display will show the factory default value, while the
secondary display will lock on the appropriate automatic standard
value from TABLE 1.