ASTM calibration weight sets, adjusted to meet or exceed ASTM Class 1-4 tolerances, two-piece construction.

Use Class 1 as a primary reference to calibrate other mass standards and use for traceability between national mass standards and ASTM Class 2 weights and lower. Class 1 is appropriate for calibrating high-precision balances with readability as low as 0.1 mg.

Knob style weights 50 kg to 1 g are cylindrical with knob. Cal-Pak 5 kg weight is a grip handle weight. Cylindrical style weights 1 to 5 kg have groove. Cylindrical grip style weights 4 to 30 kg have recessed grip. Cylindrical weights 10 to 600 g are straight cylinder.