Abstract: A device for inspecting surfaces includes a beam splitter which couples out, from an input radiation a first measuring radiation and a second measuring radiation. Both measuring radiations exhibit different properties. A first exemplary embodiment makes provision for the different property to be achieved by different polarization planes. Another exemplary embodiment makes provision for the different properties to be achieved by different wavelengths. The measuring radiations reflected by the surfaces are brought together by the beam splitter to form an output radiation which is fed to an optical receiving device. The device according to the present invention is mainly suited for inspecting surfaces in bores, especially, in blind-end bores.