Tuttnauer 2540 M analog bench top autoclave sterilizer. Manual operation features simple gauges and knobs. Self contained design, eliminating external pumps or hardware. Includes temperature and pressure indicators, sterilization timer, and pressurized door lock. Chamber dimensions are 10â€ diameter x 18â€ deep with sterilization times from 0 to 59 minutes, temperature range from 221 to 279 degrees F, and pressure range from 0 to 40 psi.