A 20 W or 30 W fiber marking head from China looks like a workshop tool and gets quoted like a commodity. For an importer it is a laser product plus a mains product plus a software-controlled tool. The risk is not that the beam will not etch metal. The risk is that the nameplate, the CE or FDA story, the voltage, and the company on the invoice describe four different objects.
This is a buyer note, not a brand ranking and not a radiation-safety manual.
1. Treat class, power, and wavelength as purchase fields
Ask for the labeled laser class, nominal power, and wavelength in writing, and require the same numbers on the nameplate that will ship. “About 30 W fiber” on WeChat is not a spec. If the quote and the plate disagree, you do not know what you are declaring at the border or showing an inspector later. A silent upgrade to a higher-power source after the sample is a different machine.
2. Destination rules are not a logo on the crate
EU-bound units need a file that belongs to this model — not a cousin marker with a different source or enclosure. US-bound laser products sit in a different regime; a CE PDF does not automatically become that file. Do not accept “we export everywhere, same machine.” Ask which market the documentation was built for, and keep that market on the PI. If they cannot name the file, you are buying a tool and improvising the paperwork.
3. Mains voltage and the controller are part of the SKU
A head built for 220–240 V will not become a 110–120 V machine because the sales sheet says “global.” Transformers and swapped PSUs change the safety file. The marking software and the motion / galvo controller are also part of the product: a DSP board swapped to hit a price can orphan both support and any EMC claim. Freeze voltage, plug type, controller family, and software version on the order line, the same way you freeze a charger model string.
4. Source brand inside the head is not the seller
Many quotes wave a well-known fiber-source name. The exporter on the PI may be an integrator who buys that source — or a trader who only bought the name. Write who is selling you the finished marker, and whether the source module is named as a component. If after-sales means “talk to the source factory yourself,” put that in the quote before you pay a deposit. A source logo on a slide is not a warranty party.
5. What to refuse in one sentence
Refuse “CE included” with no model string, “same as sample” with no plate photo, and “LM2596-style” thinking applied to lasers: a pin-compatible looking head with a different source and a different PSU is not your qualified unit.
The bottom line
A desktop fiber marker from China is specified by class, power, market file, mains voltage, and controller — all matching the plate and the PI seller. The etch test is the easy part. The file is the machine you actually imported.
If you need the power, voltage, and model-string lines written into the PI in English and Chinese, I can prepare the wording and issue a stamped set under our bilingual translation company seal when you need one. See what this covers.
Laser and electrical rules differ by destination and are updated by the relevant bodies. Confirm the file that lists your exact model before you ship. General sourcing guidance, not product-safety or customs advice.