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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.
Now that we understand the basics of calibration, why should a meter be calibrated at more than one pH value? Most pH meters should be calibrated at a minimum of two points. The most common points are values of pH 7.01 and 4.01 or 7.01 and 10.01 if you are going to be reading alkaline values.The more advanced Hanna meters will let the user calibrate at three, four or five pH values.ne more point needs to be considered. The temperature of a solution when depressed or elevated from 20 C will also contribute an error to the pH reading if the meter does not have a temperature sensor built in to correct for this variation.