Description: One mixing head for a variety of tube sizes makes the vortex mixer, by LabServ ® , the most functional unit for a range of applications requiring gentle mixing to high speed vortexing. This innovative product eliminates the need to swap out head units with a patent pending mixing head that accommodates six tube sizes (0.2, 0.5, 1.5/2, 5, 15, 50mL, a standard assay plate and includes a center pad area that can be used for quick touch operation. Innovative head can be removed for cleaning purposes. With maximum convenience and use of space available, the vortex mixer has a three position variable speed rotary dial that provides pre-set speed controls (1000, 2000, 3000 rpm) for continuous or intermittent mixing. In addition, a counter balance system and stable elastomeric device feet minimize vibration and prevents the vortex mixer from walking, even at high speeds, during operation.