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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.
HOW TO USE YOUR SOIL pH METER. 1. Remove the top 2 of the surface soil. Break up and crumble the soil underneath to a depth of 5. Remove any stones or organic debris such as leaves & twigs because they can affect the final result.