Image:Disposable foam earplugs.jpg

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Disposable foam earplugs, both out of the ear (with coins for scale) and inserted into the ear.

Taken by me. Tjwood 15:22, 8 Dec 2004 (UTC)


Public domain This image has been released into the public domain by its author, Tjwood. This applies worldwide.

In some countries this may not be legally possible; if so:
Tjwood grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.


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(del) (cur) 15:15, 8 December 2004 . . Tjwood (Talk) . . 400x900 (75242 bytes) (Disposable foam earplugs, both out of the ear (with coins for scale) and inserted into the ear,)
U.S. quarter

This image has currency in it to indicate scale.

Avoid using objects 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, and some coins' designs are not free content.

Ideally, a photograph should include a ruler with the subject (as seen in this photo) or add a scale marking via an image editor instead (as seen in this photo). SI/metric units are the most commonly used worldwide (see metre, 1 E-2 m).

Examples of bad practice: here.

A tape measure


Common coin diameters for reference:

  • U.S. dollar:
    • : 19 mm, 0.75 in
    • : 20 mm, 0.79 in
    • 10¢: 18 mm, 0.71 in
    • 25¢: 24 mm, 0.95 in
    • 50¢: 31 mm, 1.21 in
    • $1: 26 mm, 1.02 in
  • Canadian dollar:
    • : 19 mm, 0.75 in
    • : 21 mm, 0.83 in
    • 10¢: 18 mm, 0.71 in
    • 25¢: 24 mm, 0.94 in
    • 50¢: 27 mm, 1.07 in
    • $1: 26 mm, 1.04 in
    • $2: 28 mm, 1.10 in
  • Pound sterling
    • 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
  • Euro
    • 1c: 16.25 mm, 0.64 in
    • 2c: 18.75 mm, 0.74 in
    • 5c: 21.25 mm, 0.84 in
    • 10c: 19.75 mm, 0.78 in
    • 20c: 22.25 mm, 0.88 in
    • 50c: 24.25 mm, 0.95 in
    • €1: 23.25 mm, 0.92 in
    • €2: 25.75 mm, 1.01 in

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File history

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Date/TimeDimensionsUserComment
current19:11, 20 February 2006400×900 (73 KB)Clemente (Copied from en.wikipedia.org: Disposable foam earplugs, both out of the ear (with coins for scale) and inserted into the ear. Taken by me. Tjwood 15:22, 8 Dec 2004 (UTC) {{PD-user|Tjwood}} (del) (cur) 15:15, 8 December 2004 . . Tjwoo)
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