Review on INTLLAB Function Vortexer: Revolutionizing Adhesives Centrifugation in Lab & Scientific Research by Travis Coffman

So I use it to mix small vials of paint and pigments, it mixes products very well. in the center of the device, but it is made specifically for test tubes, although most of them are used by artisans for mixing paints. Surrounding the inner cutout is a metal sleeve that needs to be pushed straight down to turn on the device. If it is moved slightly off-center, it will not work, and if it slips off-center during use, it will stop. Using anything other than a test tube is problematic. I'm electronics savvy, I can basically take things apart and fix small imperfections, but this device uses a Hall effect sensor to see the metal sleeve and the rubber top is permanently bonded to the device and I didn't want to destroy it to try it and fix the error. Conclusion: Still worthwhile and cheaper than other solutions. If you're using with test tubes you shouldn't have any problems, but if you're using with small bottles be aware that you may have to struggle with it from time to time to get it to turn on and stay on.