ASTM electronic calibration avoirdupois individual weights are used when calibrating Class 1 and Class II balances, ASTM Class 4, 5 and 6 weights and tolerance checking or verification of balances.
- Nominal value marked on weights
- Serial numbers may be stamped or etched on weights (Class 2 to 4)
- Sealing cavity for adjusting material in 100 g or larger weights
- Density 7.84 g/cm3