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This hand-operated centrifuge is ideal for rapid settling of suspended solids from small quantities of liquid in analytical or clinical procedures at speeds up to 2000 RPM. The hand crank and steel worm with bronze spiral gear is set at a 15 to 1 ratio. The long-sweep crank is detachable and disengages when hand motion is stopped, allowing the head to come to a gradual rest. The driving mechanism is completely enclosed and is permanently lubricated in a one-piece cast-iron body. The unit is supplied complete with two metal shields and two 10 ml glass centrifuge tubes (one plain, one graduated). A screw clamp is provided for fastening the unit to tabletops of any thickness up to 1-3/4" (45mm).