processed material entity spectrophotometer NCIt:C62333 spectrophotometer http://www.ebi.ac.uk/efo/EFO_0002024 James Malone MO Trish Whetzel MO:716 A spectrophotometer is an instrument that measures the intensity of light as a function of the color, or more specifically, the wavelength of light, transmitted by a substance. Melanie Courtot A spectrophotometer is an instrument that measures the intensity of light as a function of the color, or more specifically, the wavelength of light, transmitted by a substance. Helios Gamma Spectrophotometer instrument ready for release