Step less speed regulator, Digital speed indicator, 1-99 min. digital timer & infinite mode, Zero start interlock, Imbalance safety cut off, Safety lid switch, dynamic brake. Operates on 220 -230 volts 50 Hz A.C. The range of centrifuges are designed for large volume centrifuge tubes for low speed applications. Supplied with fixed angle rotor head. Cap. 4 (3x15ml), RPM 4500