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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.
placing the electrodes in solutions of known pH (buffers) and measuring the voltage of the cell. Because the cell potential is a linear function of pH (usually in the range of pH 2-11), two calibration. points (2 pH buffers) are needed. Most common is the calibration with the IUPAC buffers pH 4.005. and pH 10.012 (@ 25Â°C).