Mixing solutions correctly is a large part of performing many chemical processes. In many cases, stirring solutions by hand is either impossible, undesirable or simply too time-consuming and inefficient. This is especially true for flasks and glassware with closed-off or small openings that would make it nearly impossible to effectively stir the contents within.
Enter magnetic stir controllers. Magnetic stir bars are small items that can be placed inside your glassware. A magnetic stir controller controls the rotation of the bars inside the solution. You can finely tune the speed/amount of stirring, guaranteeing you efficient, effective results.