M1 F1 F2 E1 E2 Class Standard Calibration Test Weights Shanghai Puchun Measure Instrument Co., Ltd. Base Info Model NO.:FM-SSMaterial:Stainless SteelClass:E1,E2,F1,F2,M1Specification:1mg~20kgOrigin:ChinaHS Code:8423900010 Description Pre:OIML 5kg 10kg 20kg Cast Iron Standard Calibration Test Weight Next:Mechanical Table Balance for Medical and Education