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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.
Ingeneral, once you have entered the calibration mode, the meter will first ask you to place itin one of these solutions (usually the 7.01). Then, once it has locked this value in, it will askyou to place it in the other solution (the 4.01).