Midmark Ritter M11D Ultraclave Autoclave Automatic Tabletop Sterilizer RefurbishedThe Midmark M11 is the largest of the Midmark family of autoclaves. With its 11 x 18 chamber, the M11 has the largest sterilizing capacity of any standard countertop sterilizer on the market. This steam pressure sterilizer features an LCD display with simple prompts that help you easily select the cycle that you need. Once sterilization is complete, the door automatically opens to release excess steam and ensure fast, efficient drying of all products.