Ultravioletvisible or UV VIS spectrophotometer is a machine that is used to measure the light absorption by a chemical substance through the application of quantitative technique. This machine does it by measuring the intensity of light that passes through a sample in comparison to the intensity of light through a blank. The fundamental concept of this machine is based on how chemical compounds tend to absorb ultraviolet light as a result of which distinct spectra is produced. The principle of spectroscopy with this machine is based on the interaction between matter and light. You can explore quality UV VIS spectrophotometer at Ray Analytical Technologies.