What are the common reasons for poor repeatability in measuring hardness values and large differences in multiple tests
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① The surface of the workpiece has oxide scale, oil stains, burrs, and has not been polished;
② Unstable placement of workpieces and suspended bottom;
③ Diamond indenter wear and chipping;
④ The equipment has not been leveled;
⑤ The indentation is too close to the edge of the workpiece, follow the indentation distance from the edge ≥ 2.5 times the diagonal of the indentation.
