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A '''timer''', usually called a stopwatch, is a scientific instrument used to measure how much time it takes for something to happen. ==Key Stage 3=====Meaning===[[Scientific InstrumentFile:Stopwatch2.png|right|300px|thumb|A picture of a '''stopwatch'''.]]A '''timer''', usually called a '''stopwatch''', is a scientific instrument]] used to [[measure ]] how much [[time ]] it takes for something to happen. ===About Stopwatches===: 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.