Hanna Instruments HI 3221 Instruction Manual page 16

• Press CAL. The instrument will display the measured pH, the LCD first
expected buffer and the temperature reading.
• 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, Confirm
function key is displayed.
• Press Confirm to confirm first point.
• The calibrated value and the second expected buffer value is then dis-
played on the LCD.
• After the first calibration point is confirmed, immerse the pH electrode and
the temperature probe approximately 3 cm (1¾") into the second 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.
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