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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.
When growing plants in soil, consider the pH of the water going in and the pH of the soil itself; both of these readings can be taken with a common glass electrode meter; thereâs no need for a special soil meter. Every meter is different, so follow the instructions exactly on how to calibrate and prepare the meter.