Hanna Instruments HI 3512 - Manual (Page 21)

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• When the reading is stable and close to the selected buffer, the
Confirm function key is displayed.
• Press Confirm to confirm calibration.
• The calibrated value and the third expected buffer value will be
displayed.
• After the second calibration point is confirmed, immerse the pH
electrode and the temperature probe approximately 3 cm (1¾”) into
a third buffer solution and stir gently. The temperature probe should
be close to the pH electrode.
• If necessary, press the ARROW keys to select a different buffer value.
• The “ ” tag will blink on the LCD until the reading is stable.
• When the reading is stable and close to the selected buffer, the
Confirm function key is displayed.
• Press Confirm to confirm calibration.
Repeat this procedure with two additional pH buffers to encompass the
entire sample pH range.