The Gilson GV Lab Vortex Mixer is a touch-on fixed-speed vortex mixer that allows you to quickly mix solutions or media contained in various formats of tubes or vials. Compact design allows you to lightly touch the container against the pad for instant vigorous and uniform vortexing action. Accommodates any size of tubes and vials up to 30 mm (1.18 in.) diameter. Quality Sturdy base and housing for stability and minimal vibration during use Special tube pad design prevents liquids from damaging the electronics.