SALD-3101 is a functional device with a seamless cover over a Wide Measuring Range from 0.05 to 3000µ (3mm). The foremost importance of this device is to calculate the coarse or dense particles. On the top of that it also includes fields of metals, minerals, pharmaceuticals, chemicals, environment, river conservation, disaster prevention, civil engineering, construction, agriculture and soil. Seamlessly wraps a tremendously broad range of particle diameters from 0.05 to 3000µ by means of a single measurement principle, a single optical system and a single light source. The device always accomplishes precise particle size allocation measurements across the complete calculating range by means of a single standard, devoid of data discontinuities from numerous optical system amalgamation.