User Manual

6
5 pH Measurement
5.1 How to take pH measurements
Short press to turn on the tester. Rinse the probe in distilled water,
shake off excess water. Insert the probe in your sample solution, make a
quick stir and hold still. Record the reading when it is stabilized
( appears and stays on screen).
5.2 Pure Water pH Measurement
When testing pure water like tap water, drinking water, RO water and
distilled water, it will take longer for the readings to get fully stabilized
(typically 1-5 minutes). Please be patient. If still not working, add Apera
3M KCL (AI1107) to your pure water at the ratio of 1:1000 (e.g. 1 ml KCL to 1000 ml water) to accelerate
stabilization while minimizing pH change. If the accuracy is not meeting your requirement, please contact us
at [e-mail] to find the specialized meter designed for pure water pH test.
6 Conductivity Calibration
6.1 Power on the tester. Press to switch to conductivity (Cond) measurement mode. Rinse the probe
in pure water and shake off excess water.
6.2 Pour 1413μS and 12.88 mS conductivity calibration solution into the corresponding calibration vials to
about half volume.
6.3 Long press to enter calibration mode (screen turns green).
6.4 Dip the probe into 1413 μS/cm conductivity calibration solution, stir gently and hold still. When the
reading is fully stabilized ( stays on screen), short press to start one-point calibration, the
tester returns to measurement mode and will appear at the bottom left of the screen, indicating
a successful 1
st
point conductivity calibration.
6.5 If needed (your target conductivity level is greater than 2 mS or 2000 μS), dip the probe into the 12.88
mS conductivity calibration solution. Follow the steps in 7.3 to 7.4 to complete the 2
nd
point of
calibration using the 12.88 mS standard solution. will appear next to , indicating a successful
2-point conductivity calibration.
6.6 Conductivity Calibration Notes
The tester can calibrate 84μS, 1413 μS/cm and 12.88 mS/cm conductivity calibration solution. User can
conduct 1 to 3 points calibration. Refer to the table below. Usually calibrating the tester with 1413 μS/cm
conductivity buffer solution alone shall meet the testing requirement.