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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.
Diagram of pH scale and universal indicator colours To get a more accurate measurement of the pH of a solution, we can use a pH meter. This device can measure the pH of a solution to 0.01 of a pH unit.