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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.
calibrate. 1  to determine, check, or rectify the graduation of (any instrument giving quantitative measurements). 2  to divide or mark with gradations, graduations, or other indexes of degree, quantity, etc., as on a thermometer, measuring cup, or the like.