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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===