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User‘s manual for CP-511 pH meter v1.10
After deleting the electrode characteristics (entering the calibration mode and
escaping it without calibrating at any point) the meter adopts the ideal
electrode characteristics for its calculations and the actual electrode’s
parameters are unknown. In this case, after entering in the electrode
parameters readout mode, in the place of the digital values, lines are
displayed.
One-point calibration enables to indicate only the zero offset of the electrode.
Instead of the slope value lines are displayed (Pic. 9).
Pic. 8
Return to the measurement mode by pressing the button.