Instruments and Apparatus for Measuring or Checking Electrical Quantities — Without Recording Device (NESOI)

A power quality analyzer that measures parameters such as harmonics, power factor, and voltage sags without storing data may fit the non-recording power-measuring line under heading 903033. If it lacks a recording device and is not a multimeter but also does not fit the more specific power-measuring description, the NESOI line under 903089 applies. The distinction turns on whether 'power' measurement is the instrument's primary function versus a broader electrical-quality monitoring role.

CBP can reclassify the goods, assess back duties, and impose penalties for negligent or intentional misclassification. Because the NESOI designation is a catch-all, it is only correct after systematically ruling out every more specific description in the heading. Importers with recurring shipments of specialized instruments should consider a binding ruling to lock in the correct line.