OEM calibration weight set 1. OIML mass tolerances for each class 2. High accuracy 3. Good outlook 4. OEM is available Class E2 OIML E2 OIML Material JF1 Non-Magnetism Stainless Steel Normal Non-Magnetism Stainless Steel Density 8.00g/dm3 7.94g/dm3 Magnetic Susceptibility â?¤0.006 â?¤0.01 Value 1mg-20kg Shape 1mg-500mg: Flat, 1g-20kg: cylindrical Finish Mirror polish Standard Packing