Coarse or dense particles found in the fields of pharmaceuticals, chemicals, environment, river conservation, disaster prevention, metals, soil, civil engineering, construction and agriculture can be measured with the use of the SALD-3101. Wide-measuring range from 0.05 to 3000µ (3mm) can be seamlessly covered with a single measurement principle which include a single light source and a single optical system. Without data interruptions from a multiple optical system combination this never fails to achieve precise particle size distribution measurements across the entire measuring range using a single standard. This also features Powerful Particle Circulation Mechanism. A powerful vertical radial pump with a flow rate of 5000 cm3/minute is also incorporated by the sampler. This ensures circulation of dense and coarse particles ranging from hundred microns to millimeters in size. The key technology behind the 3000µ (3mm) upper measuring limit is said to be its powerful particle circulation.