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: 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 subtracting one from the other to find the [[distance]].
===References===
====OCR====
:[https://www.amazon.co.uk/gp/product/1782945695/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945695&linkCode=as2&tag=nrjc-21&linkId=ceafcc80bcad6b6754ee97a0c7ceea53 ''Rulers, page 219, Gateway GCSE Combined Science; The Revision Guide, CGP, OCR '']