Biopharm pH Buffer Calibration Kit 3-Pack | 250 ml (8oz) Bottles | pH 4.00, pH 6.86 and pH 9.18 | NIST Traceable Reference Standards for All pH Meters
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It is ready-to-use, so there is no need to configure it.
This set of three bottles seems like it will last me for a lifetime. The calibrations are done by placing a tablespoon of each type of substance into a sandwich bag. Each week, the calculator is calibrated. Actually, I think his contract expires in two years, so two years is the answer.