The grip handle weights are Class F cast iron painted, density 7.2 for scale calibration and finished with a special etching process, then coated with a chip-resistant paint that conforms to NIST Handbook 105-1 standards. Designed for testing commercial scales, they come in 10 to 100 lbs. sizes; available in inch, metric and troy ounces; and provide NIST traceability. Suitable for field-testing and calibration by equipment installers, service technicians, and state and local officials, the grip handle weights are suitable for legal-for-trade applications. They are ideal for checking scales for proper setup and spot-checking scales before a work shift begins to identify problems prior to scheduling maintenance.