UV-VIS Spectrophotometers measure the absorption of ultraviolet and visible light by samples to determine their concentration and identity. These instruments are essential in chemical analysis, biomedical research, and environmental monitoring, as they help identify substances based on their light absorption properties. The technology works by passing light through a sample and measuring how much is absorbed at specific wavelengths. Commonly used in pharmaceutical testing, food analysis, and water quality testing, UV-VIS spectrophotometers are indispensable for determining substance concentrations.