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: Standard (top) and high-field (centre) Orbitrap mass analyzers, shown with 1 Euro (left) and a US nickel (right) as size references.
The outer (detection) electrodes are partially removed to show the central electrode within the mass analzyers.
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{{Information |Description ={{en|1=Standard (top) and high-field (centre) Orbitrap mass analyzers, shown with 1 Euro and 25 US cent coins as a size reference. The outer (detection) electrodes are partially removed to show the central electrode with...
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