The PrO-E-S education laboratory centrifuge is designed to work with high-speed low volume rotors. Included is a fixed angle rotor type BRK5404 available with 24 positions, designed to handle 2 ml tubes. Separately, you can purchase a BRK5401 hematocrit swing out rotor. 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.