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==Key Stage 2==
===Meaning===
A '''timer''', usually called a stopwatch, is a [[Scientific Instrument|scientific instrument]] used to measure how much time it takes for something to happen.
==Key Stage 3==
===Meaning===
[[File:Stopwatch2.png|right|300px|thumb|A picture of a '''stopwatch'''.]]
A '''timer''', usually called a '''stopwatch''', is a [[Scientific Instrument|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.