Sourcing laser interferometers from China

Duty and classification for laser interferometers

Read from the UK Trade Tariff on 30 September 2026, the selected lines under heading 9031 carry 0% duty for goods from China. The heading covers measuring or checking instruments not specified elsewhere. Other optical instruments are the starting point for a complete optical interferometer; the table includes related classifications for comparison, rather than interchangeable codes.

The supplied tariff record lists no anti-dumping or countervailing measures and no suspensions for these lines. It attaches fluorinated greenhouse gas import controls to 9031 80 80 00 and 9031 90 00 00. The importer should confirm the applicable requirement with their customs broker using the actual gas content and equipment description. Imported fluorinated gas equipment must be correctly labelled.

Confirm the commodity code using the measurement function, optical arrangement and whether the shipment contains complete instruments or separate parts. Separately imported optics may belong elsewhere. See the coordinate measuring machines guide for wider measuring-equipment context.

Specify the measurement task and complete optical kit

State whether you need linear displacement, angular measurement, straightness or machine-axis calibration. Agree measuring range, accuracy, repeatability, resolution, warm-up conditions and the environment in which the figures apply. Request calibration traceable to national standards, with the laser head and compensation sensors identified.

List the interferometer optics, reflectors, mounts, cables, environmental sensors and software licences in the order. Specify temperature, pressure and humidity compensation, compatible computer systems, report exports and access to raw readings. Agree factory and arrival tests using the same optical setup.

UK guidance says laser products sold in the UK should be classified to British standards. Request classification evidence for the complete instrument, labels and safe alignment instructions. For apparatus covered by electromagnetic compatibility rules, the manufacturer must supply relevant instructions in English. Ask for applicable electrical safety and electromagnetic compatibility evidence and a matching declaration of conformity.

Worked duty example

Illustrative example, not a quote: Illustrative order of four complete laser interferometer kits for a calibration business under 9031 49 90 00, invoiced at £120,000 free on board, with £6,000 of freight and insurance to the UK. The customs value is £126,000. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £126,000, so it is £25,200. With no duty, the only import tax is the VAT, which a VAT-registered importer can usually reclaim. The import duty and VAT guide explains each step.

Inspection checklist

Calibration: match instrument and sensor serial numbers to certificates; repeat the agreed displacement and repeatability checks after arrival.

Optics: inspect windows, coatings, reflectors and mounts for damage; check alignment and signal stability across the agreed travel.

Compensation: confirm sensor readings, placement and software compensation settings; record the room conditions during acceptance.

Software and safety: test licences, report exports and supplied cables; match laser labels and conformity documents to the delivered model. Use the inspection guide to organise acceptance.

What goes wrong

A kit can produce plausible readings while missing the agreed accuracy because compensation is disabled, a sensor is misplaced or the beam is poorly aligned. Missing angular or straightness optics can also leave the buyer unable to perform the intended test. Demonstrate each ordered measurement mode before dispatch.

Transport damage, dirty optics and unstable mounting can undermine factory results. Software tied to the supplier's computer can prevent use on arrival. Repeat the agreed tests in the buyer's environment and record discrepancies before accepting the shipment.

Cambridge China Bridge sources these products for UK businesses, checking the factory and the documents before shipment. See factory verification. For components and parts, see sourcing for manufacturers.