Sorvall MC-12V Microcentrifuge. Includes 18 place 45 deg fixed angle rotor (#22076) that accepts centrifuge tubes as well as tube size of: 12mm x 40mm. Variable speed up to 12000 RPM depending on rotor. Max RCF: 9,864G to 12,127G depending on rotor. 0 to 30 min timer. Pulse button. Speed dial setting. Double-latch door lock mechanism must be engaged to initiate run. Door can not be opened at speeds greater than 230 rpm during deceleration.