Cobetter sterility test device is a completely closed system for the sterility testing of pharm and biopharm products.It is based on the membrane filter method,however it eliminates the procedure of manipulating the filters.By this means the main risk of a secondary contamination and false positive results is eliminated.A peristaltic pump transfer the sample into the filtration units are filled with media and used for incubation of the filter without any contact to the environment.