Vortexer to Mix Chemicals and Samples

This vortex machine is small, but needed very frequently for several experiments. During PCR primer preparations we need it for mixing chemicals and for spinning, where I mostly use this small vortex. It just has one button to switch on and off, and you just need to put your tubes on its top for mixing, so it is very handy to use. My one recommendation for this vortex would be if the tubes could be fixed automatically rather than being placed on top so that it would be easy to mix several samples and chemicals together; this would make the vortex even more handy and efficient.