The high performance Model 5417R spins up to 25,000 x g for quick and efficient pelletization. This model offer unsurpassed safety, reliability, and ease of use. Refrigerated Model 5417R features CFC-free cooling in a compact, front-to-back design that saves valuable bench space and can accommodate a variety of microcentrifuge rotors to extend application range. 30-place capacity. Compact footprint, less than 13 inches wide. Variable-speed, brushless motor for maintenance-free operation. Speed setting and display in either rpm or RCF increments. Adjustable-speed "momentary" button for quick spins. "Soft Start/Stop" function protects delicate samples. Choice of five interchangeable, autoclavable rotors. Automatic rotor detection system senses the rotor and indicates maximum permissible speed.