Legal for Trade Scales are those that are used in commercial applications where the price of the product being sold is dependent on the weight. NTEP (National Type Evaluation Program) certified scales have undergone independent testing to verify the scale meets the manufacturer's specifications. So whenever someone buys a Legal for Trade balance, it is the best way to ensure the highest accuracy scale. Government regulations concerning weights and measurements are handled by NIST (National Institute of Standards and Technology). The laws on accuracy, capacity, and other factors affecting weight can be found in NIST Handbook 44. Every state has different laws regarding the scales that can be used for commercial applications ranging from delicatessens to weighing coldcut sandwiches at the deli counter, to fruits and vegetables at local farmer's market, shipping logistic centers for determining shipping cost, scrap metal recycling centers or precious metal buyers for weighing gold and silver.