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sensitometer

[sen-si-tom-i-ter]
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noun Photography.
  1. an instrument for testing the sensitivity of various types of film, consisting of an apparatus for exposing successive parts of the film to a light of standard intensity at successively increasing lengths of exposure.
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Origin of sensitometer

First recorded in 1875–80; sensit(ive) + -o- + -meter
Related formssen·si·to·met·ric [sen-suh-toh-me-trik] /ˌsɛn sə toʊˈmɛ trɪk/, adjectivesen·si·to·met·ri·cal·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for sensitometer

sensitometer

noun
  1. an instrument for measuring the sensitivity to light of a photographic material over a range of exposures
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Derived Formssensitometry, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012