***Note: Appearance of weight may vary from image example due to variations in weight size and/or design. 100g precision laboratory calibration weights available in ASTM Class 1, ASTM Class 2, ASTM Class 3, ASTM Class 5, and ASTM Class 7. Appearance of weight may vary from image examples due to variations in weight size and/or design. 100g electronic balance calibration weights available in ASTM Class 1, ASTM Class 2, ASTM Class 3, ASTM Class 4, ASTM Class 5, and ASTM Class 6. Appearance of weight may vary from image examples due to variations in weight size, placement of plug, and/or if weight is a straight cylinder without a finger groove. All weights are previously used and may have etchings or other surface marks from past use. All weights meet the tolerance levels for their listed ASTM class.