sen·si·tom·e·ter /ˌsɛn(t)səˈtɑmətɚ/
感光計
sensitometer
感光計; 曝光表
Sen·si·tom·e·ter n. 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 is made on the plate to be tested.
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sensitometer
n : a measuring instrument for measuring the light sensitivity
of film over a range of exposures