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: The [[Scientist|scientist's]] '''ruler''' was too short to [[measure]] the [[distance]] form the office to the [[laboratory]]
===Note for Teachers===
: Be careful not to refer to a 30cm ruler as a foot ruler. 30cm is not exactly 1 foot, since 1 foot is 12 inches and there are 2.54 cm in 1 inch. This makes a foot 30.48cm.
==Key Stage 2==
===Meaning===
A '''ruler''' is a [[scientific instrument]] used to measure distance between objects or the length, width and height of an object.