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The Adobe Flash Player is required in order to view this content. You can get it here: photometerMain Entry: pho·tom·e·ter Pronunciation: \fō-ˈtä-mə-tər\ Function: noun Etymology: New Latin photometrum, from phot- + -metrum -meter Date: 1778 : an instrument for measuring luminous intensity, luminous flux, illumination, or brightness 
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