![A selenium type photocell light meter for measuring ambient light for photographic exposure Stock Photo - Alamy A selenium type photocell light meter for measuring ambient light for photographic exposure Stock Photo - Alamy](https://c8.alamy.com/comp/AH5ARE/a-selenium-type-photocell-light-meter-for-measuring-ambient-light-AH5ARE.jpg)
A selenium type photocell light meter for measuring ambient light for photographic exposure Stock Photo - Alamy
![File:Vintage Petri 7s 35mm Film Rangefinder Camera, ATL (Around The Lens) Selenium Cell Light Meter, f2.8 Lens, Made In Japan, Produced From 1963 - 1973 (17220534782).jpg - Wikimedia Commons File:Vintage Petri 7s 35mm Film Rangefinder Camera, ATL (Around The Lens) Selenium Cell Light Meter, f2.8 Lens, Made In Japan, Produced From 1963 - 1973 (17220534782).jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/thumb/f/f3/Vintage_Petri_7s_35mm_Film_Rangefinder_Camera%2C_ATL_%28Around_The_Lens%29_Selenium_Cell_Light_Meter%2C_f2.8_Lens%2C_Made_In_Japan%2C_Produced_From_1963_-_1973_%2817220534782%29.jpg/1200px-thumbnail.jpg)
File:Vintage Petri 7s 35mm Film Rangefinder Camera, ATL (Around The Lens) Selenium Cell Light Meter, f2.8 Lens, Made In Japan, Produced From 1963 - 1973 (17220534782).jpg - Wikimedia Commons
![Weston Master light selenium cell exposure meter for calculating camera exposures Stock Photo - Alamy Weston Master light selenium cell exposure meter for calculating camera exposures Stock Photo - Alamy](https://c8.alamy.com/comp/AT1T08/weston-master-light-selenium-cell-exposure-meter-for-calculating-camera-AT1T08.jpg)