spectrophotometers

/S P EH1 K T R AA0 F AH0 T AA1 M IH0 T ER0 Z/
noun
  1. 1

    An instrument used to measure the intensity of electromagnetic radiation at different wavelengths.

Source: https://en.wiktionary.org/wiki/spectrophotometer, https://en.wiktionary.org/wiki/spectrophotometers