These ASTM Class 7 cast iron grip-handle weights include an ISO/IEC 17025 accredited certificate for applications that require formal calibration documentation, traceability records, or audit-ready support. Use them for scale verification programs where quality procedures, customer requirements, or regulatory expectations call for an accredited certificate.
Cast iron grip-handle weights larger than 5 kg/10 lb are legal-for-trade in design, making them appropriate for checking weighing devices used in commercial transactions. They are commonly used by weights and measures officials, device installers, and service technicians to test many Class III, IIIL, and IIII scales, as well as scales not marked with a class designation.

Formerly designated NIST Class F, this product family is now classified as ASTM Class 7. NIST Class F was retired for new field weights used in legal metrology applications after January 1, 2020.