Weston Master III exposure meter, 1959. Made by Sangamo-Weston Ltd, Enfield. Model No. s141.3. Photoelectric meter, two scales. Dial type calculator ASA speed .3-5000. Perforated baffle for high light levels (broken). Invercone attachment with filter for high light levels. No. B 7316.
Weston Master III Universal Exposure Meter, made by Sangamo-Weston Limited in London, 1959.
A selenium cell photoelectric exposure meter. Used to determine the correct exposure for a photograph, the Weston Master recorded light value, and indicated exposure value, f/stops, shutter speeds and Weston Ratings - Weston’s own system of film ratings.