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SITCSection 8
U.S. imports of non-optical microscopes & diffraction apparatus (SITC 87131) totaled $23.7M in July 2026, traded with 20 countries.
Importers of Non-Optical Microscopes & Diffraction Apparatus paid $1.6M in duties in July 2026 — an effective duty rate of 8.3% on $19.7M in dutiable value, based on actual customs collections rather than the published tariff schedule. Non-Optical Microscopes & Diffraction Apparatus imports of $23.7M in July 2026 ran 34% above the year-to-date monthly average of $17.7M.
Last updated: July 2026 dataElectron microscopes, ion microscopes, scanning probe microscopes, and X-ray diffraction apparatus are the principal instruments in this heading — high-value capital equipment central to semiconductor fabrication, materials science, pharmaceutical research, and nanotechnology. Unlike optical microscopes, these instruments use electron beams, tunneling currents, or X-ray diffraction rather than visible light, placing them in a distinct classification with different duty treatment. Japan and Germany are leading sources of advanced electron microscopy and diffraction systems, reflecting the concentrated manufacturing base for this precision equipment.
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84 shipments/mo
Basic heading 213 of 419 in section 8
Basic heading 87131 · $23.7M of $44.8B
Electron microscopes designed primarily for imaging and analysis classify under SITC 87131, while highly integrated semiconductor process-control tools that incorporate electron optics as one subsystem of a larger automated inspection platform may classify under semiconductor manufacturing equipment headings. The determining factor is whether the electron-optical column is the primary functional element or a component of a broader automated system.
Yes — atomic force microscopes (AFM) and scanning tunneling microscopes (STM) are non-optical instruments that use physical probe interactions rather than light or electrons for imaging, and they generally classify within the non-optical microscope heading. Importers should confirm the specific HTS subheading with a customs broker, as the precise classification can affect applicable duty rates.
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Imports · July 2026
origin
Japan and Czech Republic together supply 82% of it.
customs district
Census does not publish district detail for this classification system.
destination
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
ImportsExports
Imports
$23.7MYoY · Pro
Exports
$3.8MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.