Sitemap A legal for trade scale ensures fairness and transparency during the commercial weighing operation because it has a -legal for trade- indent marked on it. This mark guarantees accuracy in measurement because the concerned weighing scale is manufactured and tested according to the guidelines of the program. To make the weighing process more transparent, the weighing scale, which does not have a dual display unit, is marked as -not for direct sales-. This latest addition, aims to make it compulsory for all such scales to have a dual display unit instead of a single unit. A dual display unit allows the customer to have a clear and direct view of the weight reading. Hence from now on legal for trade scales, which have a dual display unit, will be used where both end user and customer are present during the weighing operation.