The impressiOn is a versatile new semi-automatic device designed to take the strain out of applying friction sealing mats or septum sealing caps to the Society for Biomolecular Sciences (SBS) format tube racks. Tube racks are a valuable tool in life science research and clinical diagnostic testing laboratories as they can be used to simplify the handling and storage of large numbers of samples. It is essential that the tube racks can be securely sealed in order to avoid contamination and evaporation. The compact unity requires only a 110v or 220v power supply. Both friction and septum seals are for 96-, 48, and 24- tube plates.