The spectrophotometric test determines the light absorption of a substance as a function of wavelength. It is most commonly used to determine the light absorption of various liquids, solutions and transparent solids (as the concentration of coloring compounds in a material changes, so does the light absorption). The material is illuminated with light of a certain wavelength (190-1100 nm) and the intensity of light transmitted through the layer of analyte is measured.

Wavelength range-  190-1100 nm, accuracy  - 1.0 nm, reproducibility -  0.2 nm.