The autoclaves are designed with traditional mechanical engineering for customers who are accustomed to and prefer straightforward, nuts-n-bolts autoclaves with time-tested quality and durability that is both economical and practical. Control panels are designed with simple controls which make these autoclaves also ideal for non-medical applications, such as tattoo parlors and beauty salons. Detail Features: Graduated sterilization timer Mechanical pressure control system Pressure overload protection Overheat protection Pressure auto door lock (only for SA-252F;optional for SA-300H) Emergency button Chamber size: 24 L