Uniform polystyrene microspheres are widely used in various scientific and industrial applications due to their consistent size and spherical shape. In biomedical research, they serve as calibration standards for flow cytometry and microscopy, ensuring accurate measurements of cell size and fluorescence. They are also employed in drug delivery systems, where their uniform size allows for controlled release of therapeutic agents. In diagnostics, these microspheres are utilized as carriers for antibodies or antigens in immunoassays, enhancing the sensitivity and specificity of tests. Additionally, they are used in material science as templates for creating porous structures or as fillers to improve the mechanical properties of composites. Their uniformity and stability make them valuable in quality control processes across industries.