photometer
pho·to·me·ter
noun
1.
measuring instrument for measuring the luminous intensity of a source by comparing it (visually or photoelectrically) with a standard source
2.
photographic equipment that measures the intensity of light
Origin
From photo- + -meter.
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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.