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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.
1 The $12 or so purchase is a good investment. 2  This meter will measure the degree of acidity or alkalinity of your soil. 3  It is important to know what kind of soil the perennials you are using in your containers prefer. 4  If your soil is not in the correct pH range, the plant will not grow well if it grows at all. This meter will measure the degree of acidity or alkalinity of your soil. 2  It is important to know what kind of soil the perennials you are using in your containers prefer. 3  If your soil is not in the correct pH range, the plant will not grow well if it grows at all.