A spectrophotometer is an instrument used in laboratories to measure the absorbance of a sample, as a function of the wavelength of an electromagnetic radiation, and thus know the concentration of substances in a solution. This equipment consists of 4 main parts: a source, a monochromator, a beam splitter, a sample area and a detector. It also has optical elements such as lenses or mirrors, which transmit light throughout the entire equipment.
It is used to measure certain compounds a drug to make sure it is effective and safe for consumers. It can measure bacterial growth or diagnose a patient based on their urine. It is also used in DNA, RNA and protein analysis.