Laboratory machine for skin processing is made of completely rustproof steel. Front side size of the small sized drum can be made of hardened glass or without it, and production process can be monitored in one that is with hardened glass. Chemicals can be added even if the drum is not stopped by adding them to steel tub, that is located in the front side of the drum. The tub, in which washing liquid has been added, provides discharge of the vat without loosing anything. Safety time adjustment can be done if it is needed. Double-hull heat system, that is located in the circulation pump, keeps the temperature at the constant level. Because of wide warriaty of models starting from 10 kg to 300 kg of clipped leather can be processed.