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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

(..) And D.O.T. ... ...is the answer. The first digital orthographic telemeter. Inside, she holds hundreds of these sensors which... ...when released into the tornado, transmit back data on wind speed... ...pressure and dew point temperature. Why didn't you tell me? Don't. (..)
1996 Twister
(..) That's what she's going to do. How? We put her up inside a tornado. She opens... ...and releases hundreds of these sensors... ...that measure all parts of the tornado simultaneously. You see, it's like this: These sensors go up the funnel and radio back information... (..)
1996 Twister