The use of norm tray cassettes is becoming standard routine in dental hospitals and at the orthodontists pactice. The Elmasonic S series now includes a special unit that takes up to 3 norm tray cassettes for simultaneous cleaning. Alternatively, the Elmasonic S 130 H can be operated holding 2 glass beakers and one stainless-steel cleaning basket at the same time. This allows the cleaning of 3 different types of items in different cleaning chemicals in only one cleaning cycle, e.g. instruments, protheses and dental drills.