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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.
Calibrating Your pH Meter. 1  1. Place your electrode in the buffer with a pH value of 7 and begin reading. 2  2. Set the pH. 3  3. Rinse your electrode with distilled water.  4. Place your electrode in the buffer with a pH value of 4 and begin 1  reading. 5. Set the pH a second time.  6. Rinse your electrode.