Easy to Use Vortex

I recommend this vortex because it is flexible to use and possesses the option to fit your tubes or use big tubes by removing the top. I use this very often in activities like mixing tissue powder with buffer as with DNA or RNA extraction or other types of experiments. The feature I like the most in this vortex is that the knob shows the rotation speed in rpm units. I have concerns as sometimes the vortex moves faster than the speed indicated on the instrument.