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I've had two of these, both accurate to +- 0.1 grams. If you've a HF in your area you can get this for less than $10 with their coupon.
http://www.harborfreight.com/digital-pocket-scale-93543.html
How do you read the weight while the disc is covering up the read out?
2nd on the Wal Mart type food scale. right at $19