Sper Scientific 850037 Large Display Conductivity Pen - Manual (Page 30)

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P4.1 and P4.2 Modes allow review of the
calibration information but are not used
during the calibration procedure.
When in Temperature Parameter (P1.0),
Resetting the Pen (P3.0) or Calibration
Review (P4.0) Setup Modes, press SET
for more than 2 seconds to return to
Measurement Mode.