Doctor Centrifuge Machine 8 Tube The Doctor Centrifuge Machine features a powerful copper motor and 8 tube holders, each capable of holding 15ml. Its suction type rubber feet and five-step speed adjustment make it ideal for collection centers and small labs. With an ABS moulded body, P.P. tube holders, and a fixed angle rotor, it is designed for stable use on flat surfaces. The transparent lid design adds to its practicality and convenience.