Particle sizing of dense colloidal systems is a very practice-oriented problem. Using optical methods multiple scattering often makes the determination of correct particle sizes impossible. We introduce a new static light scattering instrument which allows the investigation of dense colloidal systems. This instrument is a modification of a Fraunhofer setup featuring a flat sample cell, Fourier optics, and an array detection. The thickness of the flat sample cell can be varied from about 10 mu m to 5 mm. The small sample thickness highly reduces multiple scattering and allows for the investigation of dense colloidal systems. In most cases multiple scattering can be avoided by reducing the sample thickness only. In addition, data with remaining multiple Mie scattering can be inverted if the sample transmittance if above 0.3. The angular regime of the instrument is 1 degrees to 60 degrees, the minimum measuring time is 1 s and the smallest amount of substance necessary is about 0.5 mt. We present our instrumentation, the evaluation technique, and the application to latex suspensions, fat emulsions, and milk as typical colloidal systems.