Apparatus for analysing surface properties with indirect illumination

An apparatus for analysing surface properties, comprising a first radiation device which emits radiation directly onto a surface to be analysed, a first illumination device for indirectly illuminating the surface to be analyzed, at least one first radiation detector device which receives at least part of the radiation thrown back from the surface to be analysed and outputs at least one signal which is characteristic of this part of the radiation, wherein a radiation scattering device is provided which is at least partially illuminated by the first illumination device and which scatters radiation, and transmits the scattered radiation onto the surface to be analyzed, wherein the radiation scattering device is arranged outside a plane (E) which is arranged through a first radiation direction (R1), in which rays are transmitted from the first radiation device to the surface, and a second radiation direction (R2) which extends between the surface and the radiation detector device.