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: Dried red New Mexico chile peppers. Photo taken in Kent, Ohio with a Panasonic Lumix digital camera (model DMC-LS75). Dried red New Mexico chili peppers purchased from a northeast Ohio-area Mexican grocery store.
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== Summary == {{Information |Description={{en|Dried red New Mexico chili peppers. Photo taken in Kent, Ohio with a Panasonic Lumix digital camera (model DMC-LS75). Dried red New Mexico chili peppers purchased from a northeast Ohio-area Mexican grocery sto