Thermo Fisher Scientific Eutech 2700 Series - Manual (Page 19)

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5) Rinse the pH and ATC electrodes then submerse in next custom pH buffer.
Use any pH value that is at least 1.0 pH unit from custom pH standards that
have already been calibrated.
6) Repeat Step 5 with additional pH buffers (up to 5 custom buffers) in any
order. Press ESC to escape and save your calibration at any time. When the
specified number of calibration points is met, the pH calibration report page is
automatically displayed. Percentage slope is visible after two or more
calibration points have been completed.
Additional pH calibration notes:
A single point (called “offset”) calibration is allowed with pH 7.00, 6.86, or 6.79
buffers but is not allowed with Custom buffer group. Although single point
calibration is allowed with preset buffer groups, we do not recommend this.
Instead, perform at least a 2-point calibration on a regular basis.
As soon as the first calibration value is accepted during a new calibration, all prior
calibration values are erased.
The pH calibration is a calibration of the complete meter / electrode(s) system
together, not the individual meter or electrode.