This is a quality centrifuge from the German company Heraeus (Thermo Fisher Scientific bought this line) It has variable speeds between 1,600 and 5,000 rpm for up to 99 minutes. It is quiet. It has an automatic braking system to slow down when completed for faster work. There are up to 12 slots that can fit a full size tube or smaller. It has been on a regular maintenance schedule with clinical engineering and calibrated. Call or text at 801-319-5697 with a questions.