Construction: 1 g and above - two-piece 500 mg and below - one-piece
Design Features: Weights 50 kg through 1 g are cylindrical with handling knob. Weights 500 mg and below are flat with one end turned up for easy handling.
Applications:
Use as a primary reference for calibrating other mass standards and use for traceability between national mass standards and ASTM Class 1 weights and lower.
This class is appropriate for calibrating high-precision balances with readability as low as 0.01 mg