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The choice of the second buffer depends on your application: if you measure values below pH 7, use pH 4 as a second buffer. If you measure values above pH 7, use pH 10 as your second buffer. Some of our pH meter use 3 points calibration, keep in mind to always start with pH 7 first and others after.
When using a pH meter you should also: 1  Carefully read the manual for the pH meter before using it. 2  Rinse the pH meter probe with distilled water before every reading. 3  Use solutions with known pH values, see Table 2, to make sure the pH meter is accurately calibrated.