Subheading 9031 49 of the Combined Nomenclature covers optical instruments and apparatus for measuring or checking that operate using light and are not covered by more specific subheadings of Chapter 90. This category includes profile projectors (shadowgraph projectors) that cast a magnified silhouette of a measured part onto a screen for comparison against a reference drawing, optical comparators assessing dimensional conformance with tolerances, measuring microscopes equipped with coordinate stages and micrometer eyepieces, non-contact optical triangulation and distance measurement systems, and optical surface roughness measurement instruments not related to semiconductor wafer inspection. The classification criterion is the use of optics as the primary measurement method and the absence of a more specific subheading, in particular the requirement that the instrument is not designed specifically for semiconductor wafer or photomask inspection as covered by subheading 9031 41. Classification follows the GRI, particularly Rules 1 and 6. In cases of doubt, a Binding Tariff Information (BTI) ruling is recommended.

Importing optical measuring instruments under subheading 9031 49 into the European Union requires compliance with the Union Customs Code (Regulation (EU) No 952/2013). The importer must hold an EORI number and submit a customs declaration. The commercial invoice must include a detailed technical description: type of instrument (e.g. profile projector, comparator, measuring microscope), measurement principle, range and accuracy. Optical instruments as laboratory and industrial products may be subject to the Low Voltage Directive 2014/35/EU, the EMC Directive 2014/30/EU or the Machinery Regulation (EU) 2023/1230 and may require CE marking. Where delivery is to accredited calibration laboratories or scientific institutions, the importer may be eligible for customs relief procedures applicable to scientific equipment. Certificates of origin are required for preferential rates. All requirements should be verified in TARIC and applicable product regulations.

MFN duty rates for optical measuring instruments under subheading 9031 49 should be verified in the European Commission's current TARIC database. Some instruments in this subheading may benefit from zero or reduced duty rates under the WTO Information Technology Agreement (ITA), where the product and country of origin meet the agreement's conditions. Preferential rates are available under EU FTA agreements, including CETA (Canada), the EU-Japan EPA, the EU-South Korea agreement (KOREU) and the EU-UK TCA. Correct documentation of origin is a prerequisite. For scientific instruments destined for accredited laboratories or research institutions, customs relief may be available under Council Regulation (EC) No 1186/2009 establishing a system of Community reliefs from customs duty. Importers should verify the absence of anti-dumping measures in TARIC. VAT is applied on importation. All duty rates and trade measures should be verified in TARIC.

Subheading CN 9031 49 covers other optical measuring instruments. When importing into the EU, verify applicable duty rates in TARIC, check CE marking requirements (if applicable), and prepare the required customs documentation. Tariff classification should be based on the General Rules of Interpretation (GIR) of the Combined Nomenclature. If classification is uncertain, applying for a Binding Tariff Information (BTI) from the competent customs authority is recommended. Also verify whether the product is subject to import restrictions, sanctions, or licensing requirements.