Uniform polystyrene microspheres are widely used in various scientific and industrial applications due to their consistent size and shape. In biomedical research, they serve as calibration standards for flow cytometry and particle analyzers, ensuring accurate measurements of cell sizes and properties. They are also employed in drug delivery systems, where their uniformity allows for controlled release of therapeutic agents. In diagnostics, these microspheres are utilized as carriers for antigens or antibodies in immunoassays, enhancing the sensitivity and specificity of tests. Additionally, they are used in chromatography as packing materials to separate and purify biomolecules based on size. In material science, uniform polystyrene microspheres act as templates for creating structured materials, such as photonic crystals, which have applications in optics and sensors. Their versatility and precision make them indispensable in advancing research and technology across multiple fields.