5.1.3 Dip the probe in the pH 7.00 buffer solution.
5.1.4 Long press to enter calibration mode, the screen will turn green (in calibration mode, if
you decide to quit calibration, short press to return to measurement).
5.1.5 Stir the probe for a few seconds to eliminate potential air bubbles on the probe.
5.1.6 Allow it to stand still in the buffer solution until a stable reading is reached
– when appears and stays on the screen; short press to complete
1
st
point calibration and the tester will return to measurement mode.
Icon
will appear at the bottom left of the screen, indicating the middle
point of calibration has completed.
5.1.7 Rinse the probe in distilled water and dap off excess water with tissue
paper. Dip the probe in pH 4.00 buffer solution, follow the steps from 5.1.5
to 5.1.7 to complete 2
nd
point calibration. Icons will appear at the bottom left of the
screen.
5.1.8 If you are to test alkaline samples, rinse the probe and dip it in pH 10.01 buffer solution,
follow the steps from 5.1.5 to 5.1.7 to complete the 3
rd
point calibration. Icons will
appear at the bottom left of the screen.
5.2 Notes about Calibration
a) The 1
st
point calibration must be 7.00 pH. Perform the 2
nd
and 3
rd
point calibrations (4.00,
10.01, 1.68, or 12.45) immediately after the 1
st
point calibration is finished. Do NOT turn off
the meter before you calibrate 2
nd
or 3
rd
point. Otherwise, you will need to restart the
calibration process with 7.00 pH first.
b) The pH 4.00 and 7.00 buffer solutions poured into the calibration bottles can be used for
about 10 times as long as they are not contaminated and the bottles are capped when not
in use. pH 10.01 can only be used for less than 5 times of calibration as it will lose its
accuracy faster. After that, replace the buffer solutions in the calibration bottles with new
ones that are in the buffer bottles (50ml each) to keep the accuracy of the standard buffer
solutions. Keeping the freshness and cleanliness of calibration buffers is the basis for
accurate pH measurement. Do not pour used buffer solutions back into the buffer bottles in
case of contamination.
c) The tester can perform 1 to 3 points of automatic calibration. The tester can recognize 5
kinds of pH buffer solutions. For details, please refer to the following table:
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