Quality Assurance CMM Quality Roundness Tester: Used for measuring roundness, concentricity, runout, perpendicularity.Contour graph: Used for measuring component angle, radius.CMM: Used for measuring the geometrical characteristics such as position, PCD of components.Roughness Tester: Used for measuring surface roughness of finish components parameters like Ra, Rz, Rmax etc… IATF 16949:2016 Certificate Roundness Tester Contour Graph