PCR 20/40 is a surface inspection system that was derived from the ProfilControl series. It is designed to measure the dispersion related distribution of surface particles on rubber compound test strips. The strips are produced by a laboratory extruder and conveyed underneath a high resolution camera and a special illumination device. Typically about 1 meter is scanned and then evaluated. Small particles with sizes starting at 20µm are captured and used for the statistical analysis of the compound quality.