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Stainless steel F2 class calibration weights are ideal for testing portable and precision balances, they have a smoother finish and are more accurate than the M1 class stainless weights. They need to be handled with care and kept in a case or box so that they remain within the F2 tolerance. Calibration weights for re-calibrating or testing digital scales. Different scales need different size weighs to calibrate them. Please be sure you are taking the correct size weight for the scale you would like to use it with. This is a professional grade OIML F2 Class weight.