This rating is based on a 100 gram weight. I've used this to calibrate the scale to within 0.01 grams and the scale is absolutely accurate results every time. I have no reason to doubt the accuracy of these scales. When I also put a 300 gram weight from this company on the scale (after calibrating with that 100 gram weight) it read 299.98 which is within the stated error. Just in case that bothers you, know that the smallest and lightest Lego pieces weigh about 0.12 grams, and those weights are accurate to within 0.02 grams. It's damn accurate.
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