Uniform polystyrene microspheres are widely used in biomedical research as calibration standards for flow cytometry and particle size analyzers due to their consistent size and shape. They serve as essential tools in diagnostic applications, enabling accurate measurement and comparison of cell populations or other particles. In material science, these microspheres are employed as templates for creating porous structures or as additives to enhance the properties of composites. They are also utilized in chromatography as stationary phases for efficient separation of biomolecules. Additionally, uniform polystyrene microspheres find applications in drug delivery systems, where their uniformity ensures controlled release of therapeutic agents. In the field of optics, they are used to create photonic crystals and other advanced materials with unique light-manipulating properties. Their versatility and precision make them indispensable in both research and industrial applications.