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: A '''stopwatch''' can usually give a [[time]] to an [[accuracy]] of to 10 milliseconds.
: Most '''stopwatches''' have a 'lap' function that will keep the [[timer]] going in the background while the [[time]] that the 'lap' button was pressed will stay on screen until it is pressed again.
: '''Stopwatches''' are subject to [[Human Error|human error]] because [[human]]s cannot always react instantly to an event. Any time recorded is probably longer than the real time because it took time for the [[human]] to react.