U.S. imports of non-optical measuring & checking instruments and machines (nesoi) (HS 903180) totaled $363.0M in August 2026, imported from 103 countries.
Importers of Non-Optical Measuring & Checking Instruments and Machines (NESOI) paid $30.7M in duties in August 2026, an effective tariff rate of 8.46% of the $363.0M imported — duty actually collected as a share of that value, not the published tariff schedule. Non-Optical Measuring & Checking Instruments and Machines (NESOI) imports of $363.0M in August 2026 ran 10% above the year-to-date monthly average of $329.3M.
Last updated: August 2026 dataElectron beam microscopes equipped for semiconductor wafer handling (9031804000) anchor the high-technology end of this heading, while internal combustion engine test equipment (9031808060 and 9031808070) serves automotive and heavy-equipment OEMs. The broad NESOI lines 9031808080 and 9031808085 capture dimensional gauges, vibration analyzers, and other non-optical checking instruments not elsewhere classified in Chapter 90. Mexico leads US imports under this heading, reflecting cross-border manufacturing integration in the automotive and industrial sectors, with Germany and Canada also prominent. Electron beam tools sourced from Japan may carry export-license considerations in the country of origin given their dual-use potential.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
13.1K shipments/mo
Classification under 9031804000 requires that the instrument be an electron beam microscope specifically equipped for handling semiconductor wafers or devices. A general-purpose scanning electron microscope without dedicated wafer-handling features would typically classify under heading 9012 (particle-beam microscopes) rather than 9031. The presence of integrated wafer-stage automation and cassette-loading systems is the distinguishing functional criterion.
CBP classifies goods as a whole under the heading that best describes the article's primary function. Equipment designed principally to test electrical characteristics of internal combustion engines falls under 9031808060, while equipment testing other engine characteristics falls under 9031808070. Multi-function test benches are classified by essential character; importers should document the primary design intent and consult a licensed customs broker if the equipment's function is genuinely mixed.
HSChapter 90
ImportsExports
Imports
$363.0MYoY · free account
Exports
$276.8MYoY · free account
12-mo low · imports
YoY · free accountOver the twelve months to August 2026, the U.S. imported $3.9B of Non-Optical Measuring & Checking Instruments and Machines (NESOI).
Through August 2026. Source: U.S. Census Bureau.
Trade Directory
List your company under HS 903180 — Non-Optical Measuring & Checking Instruments and Machines (NESOI), so the companies trading it can find you. Be the first supplier listed.
Subheading 1 of 6 in heading 9031
Subheading 903180 · $363.0M of $712.0M
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 9031808085 | Measure/Check Inst,Appln&machines,NESOI in Chap 90 | $314.0M | 8.86% | 68.25% | $27.8M |
| 9031804000 | Electron Beam Microscope W Equip for Handl Semicon | $31.4M | 4.65% | 45.85% | $1.5M |
| 9031808070 | Equip for Testng Char of Intrnl Cmbstn Engi,NESOI | $13.5M | 8.66% | 64.80% | $1.2M |
| 9031808060 | Equip,Test Elec Character of Intrnl Cmbstn Engine | $4.3M | 6.69% | 44.03% | $285K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 9031808080 | Measuring Checking Instr, Appln and Machines NESOI | $250.1M |
| 9031808070 | Equip for Testng Char of Intrnl Cmbstn Engi,NESOI | $19.5M |
| 9031808060 | Equip,Test Elec Character of Intrnl Cmbstn Engine | $7.2M |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
Imports · August 2026
origin
Vietnam pays 12.4% duty; Mexico 0.4%.
customs district
destination
entry
rate provision · imports
30.5% enters free of duty; duty collected equals 8.46% of total import value.