Accomplish both microhematocrit and test tube separations with the new Combo centrifuge. The Combo spins either capillary tubes or test tubes by simply changing rotors -- no tools required! Achieve hematocrit separations in less than five minutes at 12,000 rpm; then accurately determine results with the included reader disc. Other features include variable speed control, 30-minute timer, suction-cupped feet and all-metal body construction.