Spectrophotometers are cheap devices and they are used in industry, where it is often necessary to determine the concentrations of substances. They are simple and reliable to use and provide the necessary measurement accuracy if it is sufficient to solve the problem. A spectrophotometer is a device that is used to measure the intensity of electromagnetic radiation at various wavelengths. It is more accurate when a specific wavelength is used to determine the parameter, rather than the range of lamp radiation.