Hanna Instruments HI 98180 - Manual (Page 19)

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• After the third calibration point is confirmed, immerse the pH electrode
and the temperature probe approximately 4 cm (1½”) into the fourth
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 CFM
functional key is displayed.
• Press CFM to confirm calibration.
• The calibrated value and the fifth expected buffer will be displayed.
• After the fourth calibration point is confirmed, immerse the pH electrode and the
temperature probe approximately 4 cm (1½”) into the fifth 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 CFM
functional key is displayed.