Image:Asbestos3USGOV.jpg

This image has a coin in it to indicate scale.

Do not use object such as coins for scale, as they 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 are particularly bad as they can reinforce a geographical bias.

Please photograph a ruler with the subject or add a scale marking via an image editor instead. SI/metric units are the most commonly used worldwide (see metre, 1 E-2 m).

Examples of good practice: with (metric & imperial) ruler and with superimposed line.
Examples of bad practice: here.

• U.S. and Canada:
  • 1¢: 19 mm, 0.75 in;
  • 5¢: 20 mm, 0.79 in;
  • 10¢: 18 mm, 0.71 in;
  • 25¢: 24 mm, 0.95 in;
  • 50¢: 30 mm, 1.18 in;
  • $1: 26 mm, 1.02 in;
  • $2: 28 mm, 1.10 in.

• UK
  • 1p: 20.32 mm, 0.80 in;
  • 2p: 25.91 mm, 1.02 in;
  • 5p: 18.00 mm, 0.71 in;
  • 10p: 24.50 mm, 0.96 in;
  • 20p: 21.40 mm, 0.84 in;
  • 50p: 27.30 mm, 1.07 in;
  • £1: 22.50 mm, 0.89 in;
  • £2: 28.40 mm, 1.12 in.

• Eur
  • 1¢: 16.25 mm,
  • 2¢: 18.75 mm,
  • 5¢: 21.25 mm,
  • 10¢: 19.75 mm,
  • 20¢: 22.25 mm,
  • 50¢: 24.25 mm,
  • 1€: 23.25 mm,
  • 2€: 25.75 mm,

• {{PD-old}} (for works out of copyright where the author has been dead for over 70 years),
• {{PD-Art}} (for photos of old paintings and art out of copyright),
• {{PD-ineligible}} (for trivial work),
• {{PD-USGov}} (for work by the U.S. federal government),
• {{PD-self}} (if the uploader and creator releases the rights),
• {{PD-user|user}} (if another user released his/her rights), or {{Copyrighted free use}}.
  • use {{PD-user-w|projectcode|projectname|username}} for users with no account on Commons.
• {{PD-author|Author's name}} - for works released into the public domain by non-Wikimedia users.
• If the work is PD for another reason, check the copyright tag page or use {{PD-because|reason}}.