1. Before using the PH meter, clean the electrode with three distilled water, and pay attention not to break the glass electrode

2. Prepare to put NAOH solution and HCL solution for adjustment next to the platform PH meter

3. Take out the fixed PH solution (PH = 7.0) in the refrigerator and put it on the platform

4. Turn on the PH meter, set the PH value, press the ︿﹀ key to select the PH and CAL options, select the CAL item among them, adjust and insert into the PH liquid (PH = 7.0), press the <> key to select the data value to 7.0 Only a small octopus appears

5. Insert the glass electrode into the solution to be measured, and then put another electrode, stirring the liquid level properly (note: do not break the glass electrode)

6. Be careful to add NAOH solution and HCL solution when the PH value you need is not reached. (According to the different adjustment range, you can choose different concentrations of adjustment solution, when the concentration is small, you can quickly add, when the concentration is large, you need to slow down)

7. Be careful not to exceed the required constant volume when adding liquid

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