A measuring device for measuring a wavefront aberration of an optical system includes a first mask for defining light that enters the optical system, and a second mask having first to fourth openings. The housing has a first housing wall which surrounds the electrical component in the circumferential direction, with the housing having an accommodation space which extends radially outward from the first housing wall from the electrical component with respect to the rotation axis of the rotor component. 3\u03bc, c) at least one slip additive andor at least one corrosion inhibitor, d) optionally at least one organic solvent, e) optionally at least one silane andor siloxane, f) optionally at least one cross-linking agent, and g) optionally at least one chromium compound. The first time domain set of amplitudes is communicated to a digital-to-analog output stage which generates an electronic test signal corresponding to the time domain set of amplitudes. , and with a detection system for the workpeice received by the gripping means.