Cardinal Scale’s Class F test weights are primarily used to test commercial weighing devices by state and local weights and measures officials, device installers, device owners and service technicians. Cardinal Scale’s test weights come in cast iron with a steel grip handle or cold rolled steel that has a painted finish. Class F Test 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 weights are also acceptable for use in verifying scales that have 0.1% accuracy or lower. Cardinal Scale certifies that their weights are calibrated to NIST 105-1 Class F Tolerances. These test weights can be used to calibrate an inaccurate scale, or just to make sure your scale is performing as accurately as it should. Cardinal Scale's calibration weights are available in 1, 5, 25, and 50 lb weights. The heavier 25 lb and 50 lb test weights come with integral grip handles to make transport easier.