Make sure that you have selected 2 points calibration in the setup menu.
2.2
Repeat the steps 1.2 to 1.3 above. When the first calibration point is completed, the display will show CAL2. The meter prompts you to continue with
second point calibration.
2.3
Rinse the pH electrode with distilled water, place the electrode (and temperature probe) into the pH4.01 or 10.01 (pH4.01 or 9.18) buffer solution. Stir
the electrode gently. Press the
continuously flashing.
2.4
Wait for the reading to stabilize, the meter shows the electrode slope and END. Second point calibration is completed.
key, the meter automatically recognizes the pH buffer solution and begins the calibration, the Calibration icon