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When buying a CMM machine, the most important accuracy is the accuracy that supports reliable inspection for your actual parts. Buyers should evaluate volumetric accuracy, repeatability, probing accuracy, thermal stability, calibration standard, and measurement uncertainty in relation to real tolerance requirements. A suitable CMM is not simply the machine with the highest accuracy specification. It is the machine that delivers stable, repeatable, and trustworthy measurement results in your working environment. Before purchasing, prepare part drawings, tolerance data, inspection frequency, and installation conditions so that the CMM configuration can be matched to your real industrial inspection needs.