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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.
Using the meters. To use either the pH meter or the conductivity meter, the idea is the same. You put the probe into a solution with a known pH or conductivity and set the meter to the known value. Then you put the probe in the unknown solution you are trying to measure.sing the meters. To use either the pH meter or the conductivity meter, the idea is the same. You put the probe into a solution with a known pH or conductivity and set the meter to the known value. Then you put the probe in the unknown solution you are trying to measure.