Wet and dry preparation, mixing, dispersing, kneading and de-aeration, as well as classifying is difficult to perfect without laboratory machines. They are used for development of new products, for processing smallest quantities of a high-tech product, for quality control, quality assurance and process optimization. The reproducibility of the results that are achieved is an essential point. The ease of operation and the high degree of flexibility is a plus. Additionally a low cleaning expenditure at the highest possible product recovery can be guaranteed.