Hanna Instruments HI 120 - Manual (Page 19)

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If the existing stored calibration is full (five calibration points), the
instrument asks which buffer will be replaced by current buffer.
Press the ARROW keys to select another buffer to be replaced.
Press CFM to confirm the buffer that will be replaced.
Press CAL to leave calibration without replacing.
Note: The replaced buffer is not removed from calibration list and it can
be selected for the next calibration points.
WORKING WITH CUSTOM BUFFERS
If at least one custom buffer was set in SETUP menu, it can be selected for
calibration by pressing the ARROW keys. Press 2nd then SET key if you
want to adjust the buffer value. The buffer value, displayed on the
secondary LCD, will start blinking.
Use the ARROW keys to change the buffer value.
After about 5 seconds you performed the last change, the buffer value is
updated. Press 2nd then SET key if you want to change it again.
Note: Custom buffer value can be adjusted in a ±1.00 pH window, around
the set value.
CLEAR CALIBRATION
Press CLR in any moment during calibration. The “CLEAR CAL” tag will
appear and “donE” message will be displayed on the secondary LCD.
All old calibrations, starting with current selected buffer are cleared and
the instrument continues calibration.
If CLR is pressed when “CLEAR CAL IF NEW ELECTRODE” message is
displayed blinking, the calibration history is deleted and the instrument
will display “hiSt” message on the primary LCD and “donE” message on
the secondary LCD, along with “CLEAR CAL” tags. The calibration process
will continue starting with 7.01 pH buffer as first buffer.
Note: If CLR is pressed during the first calibration point, the instrument
returns to measurement mode.