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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.
Correction for the effect of temperature on the measurement of pH. The temperature of the solution modifies the pH value (see Table 2) and the electrical potential which is measured by the electrode. Therefore, the measurement has to be corrected by means of a mechanism for automatic compensation, by connecting a temperature probe to the pH-meter.