UNICO PowerSpin Series centrifuges are compact, economical and quiet. We offer both fixed (FX) and variable (LX) speed models with fixed angle rotors, for 6 or 8 tubes to spin 8– 15 ml tubes. By using adapters, you can also spin tubes ranging from 2 – 7 ml. An optional Tube Holdster allows you to have up to 18 tubes or adapters at your fingertips, side-mounted on the centrifuge. PowerSpins are pre-drilled/tapped to accept optional Tube Holdsters.