Analog model bhRmi 1.0 offers variable speed control, and the Digital Display for bhRmi 2.0 allows input of the exact speed and time to achieve reproducible results. They are built Sturdy to offer greater stability and reliable results. Advanced vortex mixer with continuous or touch operating mode at variable speed control ? Mixing speed can be selected from 300 rpm for very gentle mixing to 2800 rpm for vigorous agitation ? Speed Regulation Via Rotary Knobprovides Quick acceleration with fine control ? The unique counter-balance system creates maximum vortexing action and optimized safety. ? Optimized built-in safety features against overload and current fluctuations. ? Stable suction device feets, provide vibration dampening and prevent movement during vertexing. ? The new robust dia cast alloy construction ensures the best in class chemical resistance.