Legal for trade is a designation placed on scales which have obtained NTEP certification in accordance with
the U.S. National Institute for Standards and Technology (NIST) Handbook 44 for having locked calibration
that ensures that the scale is accurate and not tampered with.
If you plan on using your scale commercially in the U.S., you should only use legal for trade scales. If you plan
on using your scale non-commercially, then a "not legal for trade" scale should suffice.