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A stopwatch is a timepiece device used to measure the amount of time elapsed between its activation and deactivation. It is commonly used in sportsscientific experimentsand other activities where accurate timing is required.
A stopwatch typically has buttons to startstopand reset the timingand may also include additional features such as lap and split time measurementscountdown timerand alarm functions. Some stopwatches are digital while others use analog mechanisms to measure time.