5. pH Calibration
Things needed in addition to what’s in the box:
A clean cup, distilled water (8-16oz), and tissue papers for rinsing and drying the probe.
5.1 Short press to turn on the meter; rinse the probe in distilled water, shake the meter in the
air and use tissue paper to dap off excess water (never rub or wipe the sensor).
5.2 Pour certain amount (about half volume of the calibration bottle) of pH 7.00 and
pH 4.00 buffer solution in separate calibration bottles;
5.3 Long press to enter calibration mode; Short press to exit.
5.4 Dip the probe in pH7.00 buffer solution, stir gently, and allow it to stand still in
the buffer solution until a stable reading is reached. When stable icon is
displayed on the LCD screen (as shown in Diagram 3), short press to
complete 1-point calibration and the tester returns to measurement mode. Indication Icon will
appear at the bottom left of the LCD screen.
5.5 Rinse the probe in distilled water and dry it. Long press to enter calibration mode.
Dip the probe in pH 4.00 buffer solution, stir gently, and allow it to stand still in the buffer
solution. When stable icon is displayed on the LCD screen, short press to complete
2-point calibration and the tester returns to measurement mode. Indication icon will
appear at the bottom left of the LCD screen.
5.6 If necessary, rinse the probe in distilled water and dry it, and dip the probe in 10.01 buffer
solution (sold separately) to complete 3
rd
point of calibration according to the steps in 5.5,
will appear at the bottom left of the LCD.
■ Notes
a) Tester will automatically recognize pH buffer solution. Users can perform one-point, two-point,
or three-point calibration. But for the 1
st
point calibration, only 7.00 pH solution can be
used. Then use other buffer solutions to conduct 2nd or 3rd point calibration. Tester!will!
automatically!recognize!5!kinds!of!pH!buffer!solutions. Refer to the table below:
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