the pH meter is caliberated using a standard solution of
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To use a pH meter, the pH electrode is first calibrated with standard buffer solutions with known pH values that span the range being measured.
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The standard solution is described in JIS. It is generally calibrated using a neutral phosphate pH standard solution of pH7(pH6. 865), a phthalate pH standard solution of pH4(pH4. 008), or a borate pH standard solution of pH9(pH9.
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