Outstanding software features (e.g. adjustable acceleration and braking ramps, 3 program buttons (only Centrifuge 5425), short function without continuous pressing of the key). OptiBowl™ design for quiet operation, even without a rotor lid. Soft-touch one-finger lid closure for ergonomic operation. Aerosol-tight Eppendorf QuickLock™ lids for simple and safe handling. Special features for Centrifuge 5425 R: Outstanding cooling system for processing temperature-sensitive samples from 0.2 – 5 mL. The compressor technology reduces vibrations and protects your samples.