Legal-for-trade on a scale means that the platform scale has undergone rigorous testing, inspection, and certification by relevant weights and measures authorities or legal metrology institutes such as the International Organization of Legal Metrology (OIML) and the National Type Evaluation Program (NTEP) to ensure its compliance with specific legal requirements for commercial use. The certification process for legal-for-trade platform scales involves thorough evaluation and verification of accuracy, repeatability, and stability.