Using coins for scale is discouraged as it will require people unfamiliar with them to look up the dimensions or guess, both of which defeat the purpose of the object in the first place. Coins can also reinforce a geographical bias, and some coins' designs are copyrighted.
Ideally, a photograph should include a ruler with the subject (example) or an added scale marking.
SI ("metric") units are the most commonly used worldwide (see meter and centimeter).
English: Image taken with Canon Powershot A480 digital camera, with flash.
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{{subst:Upload marker added by en.wp UW}} {{Information |Description = {{en|A tool known as a Bradawl, with British 1p coin for scale. 'Marples' brand, around 15cm long. 15th March 2013. For use at Bradawl}} |Source = Image taken with d...