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Cards have different sizes though. I think a one dollar bill might be better for this.

I think it would be better if it's something international.

Why not any of these types of objects, coins, notes, cards, a ruler? Most are easy to recognize.

Like it or not, a 1$ bill certainly is "something international" ;)

No, not at all. I'd be hard pressed to get a hold of one where I lived in Sweden. Yes, I could go to the bank and get $20 or $100. I have a stack of standard sized cards in my pocket.

Well you'd also be hard-pressed to get ahold of a can of Coke in North Korea but it's still "something international" ;)

Internationality of bill comes from it's usefulness for savings. So 100$ is international, and 1$ is not

I think cards usually have the same size unless it's a business card.

Most are 85.60 × 53.98 mm (ISO/IEC 7810 ID-1)

http://en.wikipedia.org/wiki/ISO/IEC_7810

I guess they make you select the type of card you're using, which gives them the known standard dimensions.

You could still trick the system into thinking you have a tiny head by using a tablet sized rectangular object.

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