densitometers

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  7. [measuring devices for phenomena]
  8. light measuring devices
  9. light absorption measuring devices
  10. densitometers
Scope note
Instruments that measure optical density of materials or objects by measuring the intensity of transmitted or reflected light; used, for example, in photography to measure the opacity of images or to determine film speed.
densitometers
Accepted term: 05-Jan-2026