Ultraviolet/visible UV/Vis spectrophotometer UV/Vis or UV-Vis spectrophotometer. UV/Visible spectroscopy offers maximum flexibility and is suitable for applications in the wavelength range from 190 to 1100 nm. In UV/Visible spectroscopy, the UV Ultraviolet Region is considered to be any wavelength less than 340 nm. Nucleic acids, purified proteins and other organic molecules are usually measured in the UV region. Visibility Area Often abbreviated as Vis. Visible spectrophotometers and colorimeters typically measure in the visible region of the electromagnetic spectrum (340-750 nm). If your samples are colored this is an indication that they will absorb visible light. If you do not need to measure in the UV region (<340 nm), a spectrophotometer or a visible colorimeter may be a more economical alternative. Spectrophotometer of UV/vis,vis with many options like Kinetics, Scanning, Multi-wavelength protein DNA etc.