The PrO-E-B education laboratory centrifuge is designed to work with low-speed low volume rotors. The fixed angle rotor type BRK5407 is available with eight positions designed to handle 10 and 15 ml tubes. Separately, you can purchase a BRK5508S swing out rotor for a maximum of 8 tubes x 5 ml. The centrifuge has four modes of operation at different preset rotor speeds. There are 4 LEDs on the front of the centrifuge showing the current operating mode. A beep sounds after the end of the program announces that the rotor has stopped.