User Manual

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(a) Check the electrode bulb and see if there are any air bubbles. If any are present, flick
the electrode with your wrist until the bubbles have been removed. Be sure to have a firm
grip when doing so.
(b) Check the pH buffer solution and see if it goes bad or has a bigger error.
(c) Restore the meter to factory setting mode (for details see item 4.4.7), then recalibrate it.
If the sensor doesnt work after the above checks, please replace the pH electrode.
4 mV and ORP Measurement
4.1 Sample Test
5.1.1. Press < > to turn on the meter, press < MODE > to switch to , then
press < UNIT > key to choose or ;
(a) This is the electrode potential measuring mode. mV value and the
temperature will be showed at the same time;
(b) This is the ORP electrode measuring mode. ORP measurement has no
temperature compensation, so there is no temperature appears in this mode;
Note: ORP is the abbreviation of Oxidation-Reduction Potential”, representing the
Oxidation-Reduction Potential of the solution, ORP is the measuring parameter for the
oxidation reduction potential of the aqueous solution. Use mV as its unit.
5.1.2. Connect ORP electrode or ion electrode, immerge it into the sample solution, stir
briefly and then set it still. When icon appears, the reading is the ORP value or the
potential value of the ion electrode.
4.2 Notes
5.2.1. ORP measurement does not require calibration. When the user is not sure about ORP
electrode quality or measuring value, use ORP standard solution to test mV value and see
whether ORP electrode or meter works properly.
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