4000RPM Capacity 20 ml x 6 Rotor Lab Laboratory Electric Centrifuge Desktop Machine Medical with Timer Speed Control: Amazon.com: Industrial & Scientific
Low Speed Centrifuge, 110V TD4C Desktop Electric Lab Laboratory Centrifuge Machine Timer and Speed Control 4000 RPM for Medical, Research, Production
Desktop Electric Lab Laboratory Centrifuge Machine Lab Medical Practice w/Timer and Speed Control - Low Speed,4000 RPM, Capacity 20 ML x 6-110v by Lucky Seven: Amazon.com: Industrial & Scientific
Gyrozen Low-Speed Centrifuge Model 406 Speed 4000 RPM (110V, 50/60Hz) - Pro Lab Supply Corp