LW Scientific ZipCombo Centrifuge 12-Place Microhematocrit Rotor. It provides all the performance of popular STAT centrifuges at a fraction of the cost. Spin down microhematocrit tubes at 12000 rpm in only 3 minutes. Change the rotor to spin micro tubes at 12000 rpms for serum in 3 minutes. Then use the digital controls to decrease the speed to spin urines in microtubes too Specifications for LW Scientific ZipCombo Centrifuge: Manufacturer: LW Scientific Additional Features: 12 Place Rotor Power: 24 volts Capacity: 1.5 - 2 ml Rotational Speed: 1000 - 12000 RPM Features of LW Scientific ZipCombo Centrifuge Uses 40mm capillary tubes Easily changeable rotors Small footprint to conserve space Comparable to popular STAT centrifuges Results in as little as 3 minutes Package Contents: LW Scientific ZipCombo Centrifuge LW Scientific ZCP-PCVC-ST12: ZipCombo Centrifuge 12-Place Microhematocrit Rotor