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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.
On our meter we have a one point calibration we usually use that one(calibrated at pH 4.00) we do have 7.00 buffer solution and 10.00 buffer solution in the house. We mainly use the PH meter to check our Ni baths and Cr(trichrome) baths. Our lowest Ni bath is 2.00 and our highest one is 4.20 our Cr we run at 3.50.