All the products are shipped from US warehouse(CA or NJ)! All the products are shipped from US warehouse(CA or NJ)! All the products are shipped from US warehouse(CA or NJ)! F1 grade 1mg-500g stainless steel scale calibraiton weights kit sets, balance weights. Total 24pcs weights, use 304 stainless steel. Packed in aluminium alloy case, with factory’s certificate. - 1x 1mg weights, 2x 2mg weights - 1x 5mg weights, 1x 10mg weights - 2x 20mg weights, 1x 50mg weights - 1x 100mg weights , 2x 200mg weights - 1*500mg weights, 1x 1g weights - 2x 2g weights, 1x 5g weights - 1x 10g weights, 2x 20g weights - 1x 50g weights, 1x 100g weights - 2x 200g weights, 1x 500g weights - 1x tweezer, 1x aluminium alloy case What's the difference between our F1 and M1 Weights: 1. F1 are more precise than M1 with smaller permission error 2. F1 use 304 stainless steel, M1 use 2cr13 stainless steel 3. M1 are with adjust bar (at the bottom of the weights), F1 are without.
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