Laser Diffraction Particle Size Analyzers determine particle size distribution by passing a laser through a dispersed sample and fitting the scattering pattern, since small particles scatter light at wide angles and large particles at narrow ones. Wet models suspend fine, sticky or agglomerated powders in liquid and cover 0.01 to 2000 um across four ranges, while dry models feed free-flowing powders and granules through an air stream. Measurement error stays under 0.5% and a full distribution takes under a minute once dispersed. Typical uses include pharmaceutical APIs and excipients, pigments and catalysts, cement and fly ash, food powders, cosmetics and mineral ores.