There are several micro stirring bars that would be appropriate for a cuvette and a semi-micro cuvette. The sizes most appropriate for a cuvette (i.e., with interior dimensions of approximately 10 x 10 mm) are 2 x 5 mm, 3 x 6 mm, 2 x 7 mm, and 3 x 8 mm. The sizes most appropriate for a semi-micro cuvette (i.e., with interior dimensions of approximately 4 x 4 mm) are 2 x 2 mm or 3 x 3 mm.
Ultimately, the ‘best’ stirring bar for a given application depends on a variety of factors (i.e., vessel type, stirring volume, stirring speed, liquid viscosity at stirring temperature, unique factors, etc.). Thus, preference and selection of the ideal stirring bar is generally determined on a case-by-case basis. Sampling several appropriate sizes, shapes, and/or materials is recommended for each application.
Micro stirring bars are also available in a variety of colors for applications where color-coding is desired.