It is an instrument of ultraviolet-visible regions of the electromagnetic spectrum used in laboratory for the analysis of the UV and Vis compounds. It has a look at the electronic transitions. The maximum absorbance of compounds and wavelength is determined. For the reflection and transmission properties of material it is the quantitative measurement. It basically deals with the near-infrared, near-ultraviolet and visible light. It can measure the intensity of the light source wavelength because it is a photometer. It is used to measure the transmittance of the gases or polished glass in the form of opaque solids, transparent solid or reflectance ...