Weights 2 kg to 1 kg are Troemner Alloy 8 or 316 Stainless Steel.
Applications:
Use OIML E1 as a primary reference to calibrate other mass standards and use for traceability between national mass standards and OIML E2 weights and lower.
OIML E1 is appropriate for calibrating high-precision balances with a readability as low as 0.1 mg.