English: Three Allium ampeloprasum (elephant garlic) bulbs, two with tunics and one without tunic and cut open, with 1-euro coin for scale
Petsa
Gigikanan
Foto
Tagsulat
Kaugalingong trabaho by user Uncaught on the German Wikipedia
This image has currency in it to indicate scale.
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).
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