English: Giant model of coded wire tag with numbers shown in comparison to the actual coded wire tags (1 millimeter length). Penny for size comparison.
Coded wire tags are placed in the snout of some fingerling salmon. The coded wire tag has numbers laser etched on the tag.
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).