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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.
Accuracy is the most important factor in measuring pH in the food industry. The requirements set forth in the above referenced standard include using a pH meter with a resolution of 0.1 pH units. Most small pocket testers, handheld meters, and benchtop meters will offer this resolution.