Reference Speciman
Surface Roughness Specimen Material Metal For Machining Method Calibrating Starrett SR Series Surface Roughness Testers Number of Pieces 1 Roughness - Ra 5.81 micron/229 uin Roughness - Rz 21.5 micron/847 uin Specimen Dimensions 2.00 in x 3.00 in Standards ISO 4287
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