Calibration weight 1 Stainless steel material 2 High accuracy 3 Class ... ,E2,F1,F2,M1,M2 4 comply with international standard Calibration weights CLASSCAPACITYMAGNETIZATIONDENSITYMATERIALPACKAGEE1,E2,F120kg-1mg ≤0.00068.00g/cm³Non ... alloy box or plastic ciycled box High accuracy stainless steel calibration weight masses