Cast Iron Grip Handle Weights larger than 5 kg/10 lb are legal for trade, which means their design is acceptable for use in checking weighing devices where the price of the item being purchased is based on its weight.

Cast Iron Grip Handle Weights are primarily used to test commercial weighing devices by state and local weights and measures officials, device installers, and service technicians. Cast Iron Grip Handle weights may be used to test most accuracy Class III scales, all scales of Class IIIL or IIII, and scales not marked with a class designation. Class F is also acceptable for use in verifying scales that have a 0.1% accuracy and lower.