Hanna Instruments HI 9321 - Manual (Page 15)

1 5
Note: The meter will automatically skip the buffer that was used for
the first calibration. pH 6.86 and pH 7.01 as well as 9.18
and 10.01 pairs of buffer solutions are also considered too close
to allow an adequate two-point calibration. Consequently,
after calibrating in one of the pair, the meter will also skip the
other buffer.
Note: During calibration, the secondary LCD displays the selected
buffer value.
Press RANGE and the temperature of
the buffer will be displayed during cali-
bration.