GRAM M1 Iron Cast Large Format weights are cast in iron with a rectangular profile, covering a range from 500 kg to 2,000 kg for the calibration and verification of balances. They deliver dependable OIML M1 class accuracy, with a maximum permissible error of just ±50 mg at a nominal value of 1 kg — the right choice for traceability of M2 and lower-class weights, and for verifying weighing instruments of OIML accuracy class II. Manufactured and calibrated according to ISO 9001, and produced according to OIML R-111, each weight is engineered for safe handling at scale: the 500 kg and 1,000 kg models feature a recess for crane lifting, while the 2,000 kg model is designed to be moved with a forklift or pallet truck.