ritter m9 ultraclave automatic sterilizer midmark the m9 autoclave couldn't be easier and is time tested for reliability. you simply load it...set it...and forget it. select your cycle and the time is set for you. press “start” and the m9 fills with the correct amount of water. once the sterilization process is complete, the door opens automatically and quietly to dissipate the steam, giving you fast drying time for your instruments.