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photometer (n.)

"instrument used to measure the intensity of light," 1778, from photo- "light" + -meter "device for measuring." Related: Photometric; photometry (1760).

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Definitions of photometer

photometer (n.)
measuring instrument for measuring the luminous intensity of a source by comparing it (visually or photoelectrically) with a standard source;
photometer (n.)
photographic equipment that measures the intensity of light;
Synonyms: light meter / exposure meter
From wordnet.princeton.edu