Chip timing
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Transponder timing (also called chip timing or RFID timing) is a technique for measuring performance in sport events. A transponder working on a radio-frequency identification (RFID) basis is attached to the athlete and emits a unique code that is detected by radio receivers located at the strategic points in an event.
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Prior to the use of this technology, races were either timed by hand (with operators pressing a stopwatch) or using video camera systems.