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sensor

noun: a device that detects or senses heat, light, sound, motion, etc., and then reacts to it in a particular way
noun: a device that responds to a physical stimulus (as heat, light, sound, pressure, magnetism, or a particular motion) and transmits a resulting impulse (as for measurement or operating a control)
synonyms: sensory

(..) - Get in here. - Yes. Oh! - Watch out. Hurry up. Come on. Trevor, the sensor's attracting the lightning. - Drop it. Drop the sensor. - What? I'm not gonna drop it. Hurry! - It's attracting the lightning! Trevor? (..)
2008 Journey to the Center of the Earth
(..) - Well, why don't you tell him, professor? Sneffels is the name of the mountain where this character Liedenbrock... ...apparently found a portal to the center of the Earth. Let's just find that sensor of yours, professor. There it is. Yes. Well, what do you need to do with it? I gotta unlock it. (..)
2008 Journey to the Center of the Earth