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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.
This potential is a linear function of the hydrogen concentration in the solution, which allows quantitative measurements to be made. Figure 1 shows a pH meter measurement setup with two separate sensors, a pH sensor and a reference sensor is shown. Nowadays, ph meters merge the two separate sensors into one electrode.