Heading 845611 covers tools that operate specifically by laser — coherent, monochromatic amplified light. Heading 845612 captures tools using other photon or light-based removal processes, such as electron beam or ion beam systems that do not meet the technical definition of a laser. The machine's operating principle, as described in its technical specifications and manufacturer documentation, is the determining factor. When a machine uses multiple energy sources, the primary removal mechanism governs classification.

Importers should verify current Section 301 list coverage for Chinese-origin equipment under 8456121010, 8456121050, 8456127000, and 8456129000. Tools from Italy, Germany, Belgium, and Japan — the leading suppliers — are not subject to Section 301, though standard MFN duties apply. A licensed customs broker can confirm current exclusion status and any applicable first-sale or assist valuation issues for high-value equipment.