Classification within the capacity-based subheadings (842381, 842382, 842389) follows the machine's designed maximum capacity as specified by the manufacturer, not its typical operating load. Importers should document the rated capacity from technical specifications or the manufacturer's nameplate, as CBP may request this to verify the correct subheading.

Yes. Scales used in commercial transactions — such as retail checkout scales or truck scales used for billing — must comply with the National Institute of Standards and Technology (NIST) Handbook 44 and may require NTEP (National Type Evaluation Program) certification under state weights-and-measures laws. These requirements are separate from and in addition to customs classification and apply after the goods enter commerce.