Sensitometer

n.

1.

(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.

Noun

1.

sensitometer - a measuring instrument for measuring the light sensitivity of film over a range of exposures

measuring device, measuring instrument, measuring system, photographic equipment