Key points
- Every check below is answerable with a document the counterparty either has or does not.
- A manufacturing address and a registered address being different is normal — but it changes what you are buying.
- Test benches with written acceptance criteria beat any quantity of “100 % inspected” claims.
- Book a third-party pre-shipment inspection on the first order, before the balance payment.
Most sourcing disasters in this category are not caused by bad products. They are caused by a buyer spending three weeks negotiating price with a company that could never have made the product in the first place. The checks below take about half an hour and usually settle the question before you discuss a single number.
1. Verify the legal entity, not the website
Ask for the business licence scan and the unified social credit code (USCC). In China this code is public: enter it on gsxt.gov.cn and you will see the registered capital, the establishment date, the registered address and any abnormal-operation entries. A supplier who hesitates to give you an 18-character code is telling you something.
Check one more thing while you are there: does the registered address look like an office, and does the company also hold a manufacturing address? Many perfectly good exporters are trading companies — that is a legitimate business model, but it should change how you negotiate and what you expect to control.
2. Ask for machines with your product in them
Every catalogue has factory photos. Very few have factory photos containing the product you are buying. Request a short video, filmed this week, of the assembly line running the model you are quoting, with the supervisor introducing themselves. This is a two-minute request for a factory and an impossible one for a trading desk.
3. Find out who makes the motor
In a sonic toothbrush the motor and its drive train are a large share of the bill of materials and nearly all of the failure modes. A manufacturer with in-house motor capability can change frequency, torque and sweep behaviour without renegotiating with a third party. A manufacturer who buys motors on the open market cannot, and will usually decline any request that touches brushing behaviour.
This is also your best question for testing technical depth: ask what happens to sweep amplitude at low battery, and see whether the answer describes firmware or shrugs.
4. Look for test benches, not test claims
"100 % quality inspected" is unfalsifiable. Ask instead: which tests are run on the finished unit, on what equipment, and against what acceptance criterion? A serious supplier has a name for each test station and a printed criterion on the wall above it. Ask for the ageing record of a specific batch number — a supplier who keeps records can produce one within a day.
5. Check the certificate holder's name
A certificate is only useful if it names the party you are dealing with. In export practice the market certificate for CE, EAC, SASO and SNI often must be held by the importer or by the brand entity placing the goods on that market — which means the factory frequently cannot be the holder, and a factory claiming to be the CE holder for a product destined for your market deserves a follow-up question.
What the factory can always produce is the test reports: EMC, LVD, RoHS, battery, materials. Ask for the report, not the cover page. A real report carries the test house's file number and the measured values, and it is checkable.
6. Test their transparency on MOQ and tooling
Ask for the price at three quantities and ask what is one-off and what is per-unit. A factory will answer in fixed cost (mould, plate, artwork, certification) and variable cost (materials, labour, packaging). A trader will give you one number and get vague when you push. The structure of the answer tells you more than the number.
7. Never skip the third-party inspection on the first order
Book a pre-shipment inspection through SGS, Bureau Veritas, Intertek or your own agent before the balance payment. It costs a few hundred dollars and it changes the entire tone of the relationship: the inspection standard becomes a shared written document instead of a subjective argument.
8. Establish who owns the tooling
If your project involves a new shell, a modified head or any dedicated mould, ask one question in writing: whose name is on the tooling, and where does it physically sit? A factory that owns the tooling owns your ability to move the product to another supplier, and that changes the price conversation in year two. Ask whether the tooling cost is invoiced separately — if it is buried in the unit price, you cannot tell whether you bought it — and ask what happens to it if you move production. A supplier with a standard answer to this is a supplier that has been asked before, which is itself a useful signal.
9. Ask what happens after the first order
The launch order is the easy one. Ask instead about the parts of the relationship that only show up later: what is the lead time on a repeat order, how much notice is needed to change the colour split, what is the policy on the brush-head interface staying unchanged for a defined period, and how will you be told if a component is substituted? A real manufacturer answers with numbers and a change-notice process. A trading desk answers with reassurance. This check also protects your consumable revenue — if the head interface can change silently between batches, your aftermarket breaks without anyone deciding to break it.
10. Get the export and battery documents before the order, not after
A powered toothbrush is regulated cargo because of the lithium cell. Ask the supplier to send the UN 38.3 test summary for the cell they intend to use, the material safety data sheet, and the air transport assessment for the model — before you place the order. A factory that holds these documents can produce them in a day. A trading company that has never shipped this specific product usually cannot, and discovering that in the week of dispatch costs more than the order. The same request is a cheap proxy for whether the supplier actually ships this product regularly.
The red flags, collected
- No MOQ tiers — only "contact us for best price".
- Certificates in a third company's name, offered as if they were their own.
- A refusal to show the assembly line, or factory photos that are clearly stock imagery.
- "We can do anything you want" — real factories push back on specifications they know will fail certification or field testing.
- Sample lead times quoted as "a few days" for a product that has to be tooled.
- A quotation that never mentions packaging as a cost line.
None of these checks requires being an engineer. They require asking a question whose answer the counterparty cannot fake — which is the entire point.
Written from the factory side for professional buyers. Figures are indicative and dated; regulatory summaries are not legal advice.
