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The "Class" determines the weight's tolerance (how close it is to the exact mass). Typical Class ASTM 1 / OIML E2 High-precision balances (0.0001g) General Lab/Quality Control ASTM 4 / OIML F1 Precision balances (0.01g to 0.001g) Retail / Shipping ASTM 6 / OIML M1 Floor scales, postal scales, food prep Personal / Hobbyist Jewelry scales, coffee scales, home use Visual Selection Guide where to buy calibration weights

: Specializes in OIML-standard weights (E1 to M1 classes), ideal for international laboratory standards. Review: Which Class Do You Need? where to buy calibration weights