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: [[Ruler]]s used in the lab are usually divided into [[centimetre]]s and [[millimetre]]s.
: Most [[ruler]]s have a [[resolution]] of 1 [[millimetre]] because that is the smallest the [[human]] [[eye]] can correctly [[reading|read]].
: To use a [[ruler]] [[accurate]]ly the [[reading]] from each end should be checked before [[subtract]]ing subtracting one from the other to find the [[distance]].