Trust is probably the only comfort here. i bought two of these cal weights for my Adam ABK 70a scale and i can only say they weigh the same. However, i am not in the drug business so i guess i am safe with the use of them. Nice to have a good reference point though. i am happy with them and they come in very, very nice padded canisters as well as very good packaging which shows a concern on the part of the shipper for 'Product in Transit' protection.