Cast Iron Class F 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 Class F Grip Handle Weights may be used to test most accuracy Class III scales, all scales of Class III L or IIII, and scales not marked with a Class designation. Class F is also acceptable for use verifying scales that have a 0.1% accuracy and lower. Cast Iron Class F 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 Class F Grip Handle Weights 5 kg / 10 lb and smaller are not legal for trade and are classified as ANSI/ASTM Class6. If you require a 2 kg or 5 lb weight for a legal for trade application, see the Stainless Steel Class F Test Weights section in this desk reference.