 In a single-beam instrument, the cuvette containing only a solvent has to be measured first.Mettler Toledo developed a single beam array spectrophotometer that allows fast and accurate measurements over the UV/VIS range.The light source consists of a Xenon flash lamp for the ultraviolet (UV) as well as for the visible (VIS) and near-infrared wavelength regions covering a spectral range from 190 up to 1100 nm.