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Photoelectric sensor

equipment used to discover the distance, absence, or presence of an object by using a light transmitter and a photoelectric receiver

Pronunciation
/ˌfəʊtəʊɪˈlɛktrɪk ˈsɛnsə/
/ˌfoʊdoʊəˈlɛktrɪk ˈsɛnsər/