This is the one I have, and it works great. Technically it's a piece of lab equipment and feels built like it. Have been using it for a couple of years, no complaints.

https://www.amazon.com/LabGenius-MI0101001-Mini-Vortex-Mixer-Clear/dp/B01CLLBZ6S/ref=mp_s_a_1_4?crid=EYRT77JMUYQA&keywords=vortex+mixer&qid=1650135874&sprefix=vortex+mixer%2Caps%2C126&sr=8-4&ufe=app_do%3Aamzn1.fos.18ed3cb5-28d5-4975-8bc7-93deae8f9840