The Heidolph Reax Top test tube vortex mixer is ideal for mixing samples in test tubes, laboratory vials and similar vessels of different diameters at extremely high speeds. The ridged mixing orbit yields consistent results and is ideal for sample dissolution. The Reax Top vortex mixer may be used with ultrasonic baths for dissolution of samples. This vortex mixer features a strong 5mm vibration orbit which provides excellent mixing results even with high viscosity media. High viscosity media and liquid samples with suspended solids can be easily mixed yielding ridged to smooth dispersion quickly. The Heidolph Reax Top test tube vortex mixer features analog dial speed control with vibratory mixing speeds from 150 to 2,500rpm. Includes 20mm convex rubber test tube shaking platform. Vortex mixer has two modes which include both continuous vortexing as well as on/off vortexing driven by downward pressure on the test tube in the recepticle cup. Vortex mixing will start when the test tube is pressed in to the recepticle cup and will stop automatically once the pressure is released.