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See more product details Issued by Shandong Yellow River Institute of Metrology, East Asian Continent Calibration Date: March 12, 2019 Calibration Standard: CN-JJG99-2006, Based on OIML R 111 Edition 2004(E) *We tried to find a way but do NOT have certificate issued by US/UK/EU institute because we can't balance the cost and the value based on the sales per year right now. *Please consider the validity before your purchase. Thank you very much for your kind understanding. Cylinder Ones: 1x 1 kg; 1x 500 g; 2x 200 g; 1x 100 g; 1x 50 g; 2x 20 g; 1x 10 g; 1x 5 g; 2x 2g; 1x 1g Flake Ones: 1x 500 mg; 2x 200 mg; 1x 100 mg; 1x 50 mg; 2x 20 mg; 1x 10 mg; 1x 5 mg; 2x 2 mg; 1x 1 mg The second one of certain weight is marked with * to distinguish. 1. Handled with care and taken lightly. 2. Kept properly and shall not be placed in a wet, dusty environment. 3. Please use with tweezer or gloves. Do not touch with naked hands. 4. Count the quantity to avoid losing before or after using. The plastic case is very helpful to storage tiny ones. 5. Clean the dust on surface by a soft brush or cleaning cloth before use. 6. The temperature of the weights should be the same as the temperature in the laboratory. 1. F1 is more precise than M1, with smaller permission error. 2. F1 uses 304 stainless steel, M1 use 2cr13 stainless steel. 3. M1 is with adjust bar (at the bottom of the weights), F1 is without.