The Tuttnauer EL Laboratory series of steam sterilizers can be found in benchtop forms and are automatic with microprocessor controls. It uses a reservoir for handling water and can recirculate steam as necessary to keep the autoclave from having to be linked to a constant water supply. It can also be cleaned through external heating materials. Tuttnauer makes units that can hold 23 to 160 L in materials depending on the model. This device is useful for sterilizing solid materials like filters and tubes as well as glass or plastic materials. People can also choose to get their autoclaves customized based on the needs that they have when using them. This is designed to make the sterilization process as effective as possible.