#photometer  measuring instrument for measuring the luminous intensity of a source by comparing it (visually or photoelectrically) with a standard source
  supertype:  measuring_instrument__measuringinstrument__measuring_system__measuringsystem__measuring_device__measuringdevice  instrument that shows the extent or amount or quantity or degree of something
  subtype:  spectrophotometer  a photometer for comparing two light radiations wavelength by wavelength

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