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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.
If it's too low, add a pH decreaser. pH. pH is a basic measure of acidity or basicity in your water, and it's one of the most important factors in balancing your pool. On a scale of 0 to 14, 7 would be considered neutral with an ideal range falling between 7.2 and 7.6.