User Manual

4
3 Preparation Before Use
3.1 Pull out the battery insulation slip, and take off the probe cap.
3.2 Rinse off the probe in pure water (preferably distilled or deionized water. RO water or tap water is the
alternative) , then shake off excess water.
3.3 Perform calibration. For pH calibration tutorial, refer to Section 5; for conductivity calibration, refer to
Section 7.
3.4 If the tester hasn’t been used for a long time (over 1 month), please soak the probe in the 3M KCL
soaking solution for 15 minutes, then calibrate it before test.
4 pH Calibration
4.1 How to Calibrate
4.1.1 Short press to power on.
4.1.2 Pour pH buffer solutions in the correspondent calibration vials to
about half volume.
4.1.3 Rinse the probe in pure water; Shake off excess water. Dip the
probe in the pH 7.00 buffer solution first, and make a quick stir in
the solution, then hold still.
4.1.4 Long press to enter calibration mode, screen will turn green
(Short press if you decide to quit calibration and return to
measurement mode).
4.1.5 Wait for the reading to stabilize (when stays on the screen), then
short press to start the 1
st
point calibration. After calibration is
completed, the tester will return to measurement mode. Icon will
appear at the bottom left of the screen, indicating a successful 1-point
calibration (middle point).