photo meter

photometer

[foh-tom-i-ter]
noun Optics.
an instrument that measures luminous intensity or brightness, luminous flux, light distribution, color, etc., usually by comparing the light emitted by two sources, one source having certain specified standard characteristics.

Origin:
1770–80; < Neo-Latin photometrum. See photo-, -meter

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World English Dictionary
photometer (fəʊˈtɒmɪtə)
 
n
See also spectrophotometer an instrument used in photometry, usually one that compares the illumination produced by a particular light source with that produced by a standard source

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