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Answer for the clue "A measuring instrument for measuring the light sensitivity of film over a range of exposures ", 12 letters:
sensitometer

Word definitions for sensitometer in dictionaries

WordNet Word definitions in WordNet
n. a measuring instrument for measuring the light sensitivity of film over a range of exposures

Wiktionary Word definitions in Wiktionary
n. (context photography English) An instrument used to measure the sensitivity of photographic film to light.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Sensitometer \Sen`si*tom"e*ter\, n. [See Sensitive ; -meter .] (Photog.) An instrument or apparatus for comparing and grading the sensitiveness of plates, films, etc., as a screen divided into squares of different shades or colors, from which a picture ...