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I've only tinkered so far, but I've just ordered a set of calibration weights to have a proper play next week.

Watch this space!

A US nickel coin weighs exactly 5g.

Edit: if you happen to be in that exotic locale. I'm sure other coinage has similarly consistent weight.

A dollar bill weighs 1g.

That's cool. I assume that holds for any American bill, since they're all the same size?

indeed it does. I have done it with 10 bills of mixed denominations and it's 10 grams on a scale.