phototimer
noun
pho·to·tim·er
ˈfōt-ō-ˌtī-mər 
: a photoelectric device that automatically controls photographic exposures (as to X-rays or light)
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“Phototimer.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/phototimer. Accessed 8 Nov. 2024.
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