Devices that consist of a motion sensor coupled to a timer that responds to the presence or absence of movement. Motion timers are commonly used to save/conserve energy/electricity.
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ARBOR SCIENTIFIC BEE SPI V VELOCIMETER
Use the new BeeSpi V advanced self-contained photogate to measure free fall speeds, cars and projectile velocities. Two parallel photogates detect, measure, and display speeds of any objects that pass through, from zero to 99.99 km/h (measures in m/s too).