Can you calibrate your scale? If so, get something like this.
Ordered this at the same time - 100 gram calibration weight for $3.19 shipped.
http://www.amazon.com/gp/product/B000EG6T0A
do you have a kitchen scale that you can use to weigh it? looks like it may be a calibration weight like this one with the top pulled/broken off http://www.amazon.com/Gram-Chrome-Scale-Calibration-Weight/dp/B000EG6T0A