Category for specialized equipment that quantitatively measures and analyzes particle size distribution of powders and particles. Utilizes measurement principles including laser diffraction, dynamic light scattering, sedimentation, and sieving methods to precisely measure particle size distribution from nanometer to millimeter range. Essential for quality control and product development in manufacturing processes of powder metallurgy, ceramics, pharmaceuticals, cosmetics, paints, toners, and other industries. Includes equipment such as particle size analyzers, particle sizers, and laser particle counters, supporting material property evaluation and process optimization through particle size distribution data. Specialized measurement equipment focused on statistical particle size distribution analysis, distinct from simple dimensional measuring instruments or microscopes.