4.1.4 Wait for the reading to stabilize (when stays on the screen), then short press
again to nish the rst point calibration (pressing too early could lead
to Er2 error). "7.00" will be ickering and the meter will return to measurement
mode. Icon (the middle point) will appear at the bottom left, indicating a
successful 1-point calibration.
4.1.5 To calibrate the 2nd point, rinse o the electrode with pure water and remove
excess water. Dip the electrode into pH 10.01 solution and repeat Step 4.1.3 to
4.1.4. "10.01" will be ickering and (the high point) will show up next to
, indicating a successful 2-point calibration.
4.1.6 To calibrate the 3rd point, rinse o the electrode with pure water and remove
excess water. Dip the electrode into pH 4.00 solution and make a quick stir, then
repeat Step 4.1.3 to 4.1.4. "4.00" will be flickering and (the low point) will
display next to and , indicating a successful 3-point calibration.
4.2 NotesaboutCalibration
4.2.1 Always start calibrating with pH 7.00 first. Perform the 2nd and 3rd point
calibration immediately after the 1st point is finished. Do NOT turn off the
meter before you calibrate the second or third point. Otherwise, after you
restart the meter and perform calibration in pH 4.00 or pH 10.01, Er1 error
will be generated and you will have to calibrate with pH 7.00 again. For more
troubleshooting tips with calibration, refer to Section 14.
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