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Factory Calibration. Guaranteed out of the box to .003 accuracy of 6-inches Gauge head is CNC machine perfectly square to the bar and table ( no stampings) Vernier scale allows fast, 1/10th-degree angle adjustments Microadjuster allows additional angle adjustment to 1/100th degree Postive stops at 0, 10, 22-1/2, 30 and 45-degrees; limited lifetime warranty