Power Spin LX spins at 4,000 rpm. The benefit of this increased speed is a cleaner, more complete separation of cellular components thus yielding a superior serum or plasma specimen. The Power Spin series centrifuges are extremely quiet for a better working environment. All Power Spin models have a timer and on/off switch as well as other features that are normally only found on units costing much more.. For series FX/VX/LX/MX and Porta Spin centrifuge. 25mm tube size. Pack of 10. . . UNICO C800-03 Short Tube Adapter for Series FX/VX/LX/MX and Porta Spin Centrifuge, 25 mm Tube Size (Pack of 10). C800-03. Country of Origin : United States.