Hanna Instruments HI 3512 - Manual (Page 25)

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Use the ARROW keys to change the buffer value.
Press Accept to accept new value or ESC to exit mode.
Note: Custom buffer value can be adjusted within a ±1.00 pH window,
around the set value.
WORKING WITH MILI pH BUFFERS
HANNA millesimal pH buffers are ± 0.002 pH buffers formulated to
correspond to nominal pH values. (1.000, 2.000, 3.000, 4.010, 5.000,
6.000, 7.010, 8.000, 9.000, 10.010, 11.000, 12.000, 13.000 and 9
that fall between). These buffers require the user to use the closest
standard buffer and adjust it, or to use custom buffers. With these buffers
it is possible to closely bracket the measurement range of interest and
insure an accurate measurement.
The resolution of the meter must be set to 0.001 pH (see SETUP on page 40).
Eight buffers are stored in instrument for calibration.
If calibration is invoked using millesimal buffers, the calibration buffer
can be modified within a ±0.020 pH range in accordance with the
label on the calibration buffer.
Press Change to enter buffer adjust mode.
Use ARROW keys to change the buffer value.
Press Accept to accept new value or ESC to exit adjusting mode.
CLEAR CALIBRATION
Press Clear function key when displayed to clear previous calibrations.