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A '''ruler''' is a [[scientific instrument]] used to [[measure ]] the [[distance ]] between objects or two points.===About Rulers===: [[Ruler]]s can be used to [[measure]] the [[length]], [[width ]] and [[height ]] of an [[object]]s. ==Key Stage 3=====Meaning===A [[ruler]] is a [[scientific instrument]] used to [[measure]] the [[distance]] between two points. ===About Rulers===: [[Ruler]]s used in the lab are usually divided into [[centimetre]]s and [[millimetre]]s.