50mL Bioreactor Spin Tubes are ideal for use with an automated liquid handling platform or robot. They represent a novel integration of two common technologies - septum and filter membrane - into a single device. The resealable septum facilitates the use of various syringes, pipettes, etc. for easy access to samples without compromising sterility for repeated or intermittent sampling - while the 0.2 µm PTFE filter membrane maintains a sterile environment while allowing for proper airflow and gas exchange.