Calibration weight 1 Stainless steel material 2 High accuracy 3 Class E1,E2,F1,F2, ... ,F120kg-1mg ≤0.017.94g/cm³ Non-magnetic stainless steel black aluminum alloy box or plastic cycled boxF1,F220kg-1mg≤0.057.85g ... alloy box or plastic ciycled boxM120kg-1mgnone7.85g/cm³2 Cr 13 stainless steelsivery aluminum alloy box or plastic ciycled box High accuracy stainless steel calibration ...