European Class B standard, with three pre-vacuum and depth of the pre-vacuum drying function. Residual humidity is <0.2; Vacuum ability up to -0.85bar. Apply to sterilize various types of instruments like packaged, non-packaged, solid, A type hollow, B class of porous and hollow tube. To be sure remove the internal air of Hollow instruments(such as High-spped hand piece) with high efficient and sure the higher temperature steam reach every corner. A unique function of sterilizing cotton wool, not only sterilization equipment, but also the assistant of your job. There have BOWIE & DICK test and Helix tests for detection of steam penetration. The data of sterilization can printed by external mini-printer which is one of optional device or be downloaded by USB port