The Benchmark Scientific B4000-18-E BioClave 18 Research Autoclave, 18 liter, 230V is designed specifically for the sterilization of laboratory research tools. The B400018 include a mechanical and electrical safety interlock that prevents the door from being opened until the pressure has reached zero PSI. The B400018E is fully automatic operation with a large digital LCD display. The B400018E offer preset cycle options (standard programs), for use with liquids, wrapped research instruments, or unwrapped instruments/plasticware.