Scilogex 821200049999 MX-S Variable Speed Vortex Mixer, US Plug Voltage/Frequency: 110V/60Hz, US Plug Quiet and compact stable design Continuous or touch operation Steel base, silicone feet for ultra stability and vibration damping The MX-S is a compact and stable and offers variable speed from 250 to 2500 rpm. Electronic speed control ensures the same speed is maintained at all times, even during changes of load and also features continuous or touch operation. The orbital diameter is 4 mm, providing an effective and efficient mixing inside the sample. A wide range of accessories is available.