So I'm a data scientist with access to a Mettler Toledo lab balance. I have calibrated the scale using commercial 1.00g and 1000.00g calibration weights which have a tolerance of 1.0%. The weights in this set were surprisingly accurate, only the 5.00g weight was 0.01g off. More than enough for personal use at home on a kitchen scale. Other reviewers may claim that the weights on their scales aren't accurate, but unless they're using a commercially calibrated scale, you won't know if it was the weights or their scale. All in all a great and inexpensive product.
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