Here is a nice Calibration Set consisting of 9 weights ranging from 1 gram to 100 grams. They come packed in a plastic case along with the manufacturers certificate.

Included

• 100 gram
• 50 gram
• 20 gram (2)
• 10 gram
• 5 gram
• 2 gram (2)
• 1 gram

Specification:

OIML R111 Class M2

Weight(grams)	Accuracy(mg)
100	15
50	10
20	8
10	6
5	5
2	4
1	3