Hanna Instruments HI 8711 - Manual (Page 29)

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Rinse pH electrode and the reference thermometer thoroughly with pH
4.01 rinsing solution, then immerse them in pH 4.01 (HI 7004) or pH
10.01 (HI 7010) buffer solution.
Note: For accurate readings, use pH 4.01 if you are going to measure
acid samples or pH 10.01 for alkaline measurements.
Shake briefly and wait one minute before adjusting the SLOPE trimmer
to display the ph value of the buffer solution, i.e. pH 4.01 (or 10.01)
at 25°C (77°F).
If the buffer solution temperature is different from 25°C (77°F), refer
to the "pH vs. temperaturare" chart on page 30 for the appropriate pH
value at the noted temperature.
The calibration is now complete and the instrument is ready for use.
Note: If a Pt100 temperature sensor and Matching Pin is used,
immerse them into the buffer solutions during calibration
together with the electrode.