Online sellers have a different problem from traditional importers. A department store buyer can absorb a few percent of defective units. A seller shipping 3,000 units to an Amazon warehouse can’t, because one batch of poor product turns into returns, one-star reviews, and a listing that drops in search. The cost of a defect is much larger than its unit price, and product inspection in China is the cheapest point at which to deal with it.
Order sizes in this segment are small, often 500 to 5,000 pieces. That changes how inspection works. The standard approach pulls a random sample according to AQL tables and accepts or rejects the lot based on the number of defects found. For a lot of 1,000 at general level II, the sample is 80 units. That’s fine for finish and cosmetic checks. For high-risk features such as a battery, a seal, or a safety component, many sellers ask for 100 percent testing on the critical function, which is practical at this volume.
Start with a golden sample. Before production, the factory sends you a finished unit that you approve in writing. A second identical unit stays with the factory, and ideally a third goes to the inspector. Without it, ‘meets specification’ means whatever the factory thinks it means. Disputes over colour, texture, and finish are the most common ones, and a physical reference ends most of them.
Amazon-specific requirements are where small sellers get caught. Each unit needs a scannable barcode, either the manufacturer barcode or an FNSKU label, and it must be readable and match the listing. Polybags with openings above a certain size need suffocation warnings in the required languages. Cartons need clear labels and weight limits for handling. An inspector working from your checklist can scan a sample of barcodes against the listing and photograph labels, which takes minutes and avoids rejection at the warehouse.
Function matters just as much. For electronics, that means powering units on, testing every button and port, and running the product through a normal use cycle. For household goods, it means opening and closing, filling and pouring, or assembling the product exactly as the customer will. Reviews that complain about a lid that doesn’t fit or a charger that stops after a week usually trace back to a check that wasn’t done.
A carton drop test deserves a place on the checklist. FBA warehouses handle inbound cartons roughly, and your supplier’s retail packaging isn’t designed for it. The test drops a packed export carton from a set height onto its corners, edges, and faces, then checks the contents. Damage here points to inadequate inner packaging, and fixing it before the container ships costs a few cents per unit.
Photos and video do real work. Ask for images of the packed carton, the shipping mark, the product out of the box, and any defect found, along with a short video of a function test. You’ll be making a decision remotely, perhaps from another continent, and detail is what lets you do it with confidence.
Time pressure is real for sellers. Inbound windows, ad campaigns, and seasonal peaks all depend on goods arriving on schedule. Booking the inspection for when production is about 80 percent finished, rather than fully packed, leaves a few days to rework. InspectionService.com offers this kind of scheduling for China-based orders, and the report format suits sellers who need to decide quickly.
Returns data is a useful guide to what to inspect. If your product category shows complaints about missing parts, wrong colours, or damaged packaging, put those items at the top of the checklist and tell the inspector why. A generic form gives generic results. Sellers who send a one-page brief listing the five failures they most want to avoid, with photos of earlier defects, tend to get reports that address those failures directly. It takes thirty minutes to write and changes what the inspector looks for on the day. The same brief can be reused on each reorder and updated as new issues appear.
Finally, keep records by factory audit. If the same defect shows up on three consecutive orders, that’s a reason to change factories rather than keep inspecting around the problem.