It might be a photoelectric switch
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Is there a type of level switch, as shown in the photo, that is installed inside a sealed box to detect water levels, with two states: presence of water and absence of water? What is this switch called? What principle? Where can it be bought?
This is a capacitive proximity switch produced by EFOEM in Japan; it is no longer in production, so other brands are available for purchase
Eufemian is a German brand: lol
Similar to the lighting in a hotel room’s closet, the light turns on when the closet door is opened and turns off when the door is closed.
A flow switch or a level switch?