The phrase, legal for trade scale means, a weighing scale, which is granted the legal permission to be used for commercial operation. Such a scale is used for weight measurement in a manufacturing, retail or trading facility where accuracy in the weight is of paramount importance. The National Conference on Weights and Measures (NCWM) runs a program called National Type Evaluation Program or NTEP to oversee the enforcement of guidelines laid out in handbook 44 of National Institute of Standards and Technology (NIST). The program ensures that manufacturers, users and officials from the department of weights and measures interact and cooperate with each other, and implement the guidelines of the program so that manufacturer can manufacture and sell the legal for trade scale for commercial…