SOURCE: I have fuzion rogue -650 digital pocket scales but
You can use the weight of coins to calibrate the scale. Since I don't know where you are here are some examples.
use the newest cleanest ones you can as they do wear and change slightly
http://www.usmint.gov/about_the_mint/?action=coin_specifications
http://www.royalmint.com/discover/uk-coins/coin-design-and-specifications
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