Legal Metrology is a branch of law that deals with the regulation of weights and measures, ensuring that they are used accurately and fairly in trade, commerce, and industry. It is aimed at protecting consumer interests by ensuring that goods are sold in correct quantities, and that measuring instruments used in transactions, such as weighing scales, fuel dispensers, and thermometers, are properly calibrated and compliant with legal standards. Legal Metrology ensures that consumers receive the quantity and quality of goods they are paying for, and that businesses are adhering to fair trade practices. In many countries, including India, the Legal Metrology Act and its associated rules govern the manufacture, sale, and use of weights and measures, as well as the labeling of products, to prevent fraud and maintain consumer confidence.