The use of norm tray cassettes is becoming standard routine in dental hospitals and at the orthodontists pactice. Elma has how designed a special unit that takes up to 2 norm tray cassettes for simultaneous cleaning. Alternatively, the Elmasonic S 90 H can be operated holding one glass beaker and one stainless-steel cleaning basket at the same time. This allows the cleaning of different items in different cleaning chemicals in only one cleaning cycle, e.g. instruments, protheses and dental drills.