Image:SecurityTokens.CryptoCard.agr.jpg

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Several security tokens with a U.S. penny coin for comparison.

Left: Calculator-style card allows secure entry of a Personal Identification Number (PIN).
Top: USB token.
Right: Smart card format
Bottom: Key chain fob with onetime passcode displayed.

This image has currency in it to indicate scale. Please add the size of the coin to this template: For example, {{NoCoins | {{convert|19|mm|in}} }} for a US or Canadian one-cent coin.

Using objects such as coins for scale is discouraged, 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.

If possible, upload a photograph of the subject using ruler for scale (example) or add a scale marking via an image editor instead (example). SI/metric units are the most commonly used worldwide (see metre, 1 E-2 m).

Common coin diameters for reference:
U.S. dollar: 1¢: 19 mm, 0.75 in; 5¢: 21 mm, 0.84 in; 10¢: 18 mm, 0.71 in; 25¢: 24 mm, 0.96 in; 50¢: 31 mm, 1.21 in; $1: 26.5 mm, 1.04 in.	Canadian dollar: 1¢: 19 mm, 0.75 in; 5¢: 21 mm, 0.83 in; 10¢: 18 mm, 0.71 in; 25¢: 24 mm, 0.94 in; 50¢: 27 mm, 1.07 in; $1: 26.5 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.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. Subject to disclaimers.

I took this picture, with permission, at the CryptoCard booth during the LinuxWorld 2005 trade show in Boston, Massachusetts. --agr 02:55, 18 Feb 2005 (UTC)