The Beckman Coulter LS 13 320 Series is a system of multifunctional particle characterization tools. Its patented state-of-the-art, laser-based technology permits analysis of particles without the risk of missing either the largest or the smallest particles in a sample. The LS 13 320 technology is based on Fraunhofer and Mie theories of light scattering. The LS 13 320 differs from other laser-based instruments by virtue of its wide dynamic size range, number of size channels and sample measurement options.