Specifications:  OIML R 111-1 Edition 2004 (E): The Standards of Weights & Measures (General) Rules, 1987 IS: 1056-1993  Accuracy class: M1 of IR-111 Construction: 50kg to 20g have an adjusting cavity; 10g to 1mg are solid   Shapes available: 50kg - Cylindrical with handle 20kg to 1g - Cylindrical with knob 500-50-5mg - Pentagon (IR-111) 200-20-2mg - Square 100-10-1mg - Triangle 500 to 1mg - Cylindrical with raised corner