North American Industry Classification System
U.S. imports of Instruments for Measuring & Testing Electricity and Electrical Signals (NAICS 334515) totaled $856.6M in August 2026, imported from 123 countries.
Importers of Instruments for Measuring & Testing Electricity and Electrical Signals paid $67.2M in duties in August 2026, an average duty rate of 8.03% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule.
Last updated: August 2026 dataOscilloscopes, multimeters, power analyzers, and signal generators used in electronics manufacturing, utilities, and R&D laboratories are the primary traded goods within NAICS 334515. These instruments are widely sourced globally, with established manufacturing bases in Europe and Asia supplying the US market alongside domestic producers. Section 301 tariffs affect a meaningful share of electrical test and measurement equipment originating from China, and the rapid pace of product innovation means that classification of new instrument types — particularly software-defined or PC-based instruments — can be genuinely ambiguous. FCC equipment authorization may be required for instruments that emit radio-frequency signals as part of their test function.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
32.0K import shipments a month
PC-based or software-defined instruments — where the measurement function is performed by a standard computer running specialized software with a plug-in hardware module — present classification challenges. CBP generally looks to the essential character of the article; if the hardware module is the functional core, it may classify as a measuring instrument, but if the PC dominates, it could classify as an ADP machine. A binding ruling request to CBP is advisable for novel instrument architectures.
Test and measurement equipment that intentionally or unintentionally emits radio-frequency energy may require FCC equipment authorization before it can be marketed or used in the US. Many professional-grade instruments qualify for exemptions under FCC Part 15 rules for test equipment, but importers should confirm the applicable exemption or authorization category with an FCC regulatory specialist, particularly for instruments that generate RF signals as part of their test function.
National industry 2 of 9 in naics industry 33451
National industry 334515 · $856.6M of $6.6B
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Imports · August 2026
origin
China pays 34.7% duty; Mexico 0.6%.
customs district
Census does not publish district detail for this classification system.
destination
Census publishes state breakdowns for NAICS to the 4-digit level only. See NAICS 3345 for those.
entry
Census does not publish port detail for this classification system.
ImportsExports
Imports
$856.6MYoY · free account
Exports
$850.6MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $9.6B of Instruments for Measuring & Testing Electricity and Electrical Signals and exported $9.0B.
Through August 2026. Source: U.S. Census Bureau.