A European Class S Standard this sterilizer is one time pre-vacuum and after-vacuum drying functions with residual humidity of <0.2 percent. Its vacuum measurement reaches -0.8 bar. This sterilizer can be used for solid or hollow instruments in special envelop packets, small devices with apertures, A type or B type hollow instruments. It is installed with BOWIC & DICK to measure water steam penetration and a mini-printer to record sterilization process.