A pre-shipment inspection checks a finished FBA batch before it leaves the factory, and the thing that decides whether the money is well spent is not which firm you hire — it is what you put on the checklist. Commission the inspection against Amazon’s own published inbound requirements (FNSKU scannability, poly bag thickness, suffocation warnings, carton limits, box content) and against a defect classification you write yourself. An inspector working from their own template checks general merchantability. Amazon does not refuse shipments for general merchantability; it refuses them for specific, published, boring rules.
This guide covers what to specify, how AQL sampling decides pass or fail, and how to read a quote when three vendors price the same-sounding job three incompatible ways. It is not a ranking of inspection companies. For vetting the firm itself, the China sourcing agents guide covers fee models and red lines; for a named shortlist of inspection and prep providers, AMZFinder keeps a roundup of FBA inspection and prep services.
What a Pre-Shipment Inspection Is, and When It Happens
A pre-shipment inspection (PSI) is an on-site visit by a third party once production is finished and packed — by industry convention, at 80% or more of the batch. The inspector samples the packed cartons against a specification you supply and issues a pass/fail report with photographs. That report is your last look at the goods while you still have leverage: before the balance payment clears and the container leaves.
Four services are sold under adjacent names and are not interchangeable:
- During-production inspection (DUPRO) — mid-run, catches a systemic defect while it is cheap to fix.
- Pre-shipment inspection (PSI) — this guide; final goods, packed, sampled.
- Container loading supervision — watches the goods go into the container.
- Prep-centre inspection — in the destination country after the goods land, at the facility that will also label and bag them. It cannot send a bad batch back to the factory.
Only the first two can change anything at the factory.
Build the Checklist From Amazon’s Requirements, Not the Inspector’s Template
This is the section that makes an FBA inspection different from a generic one. Every item below traces to an Amazon page, and every one of them can fail a shipment at receiving even when the product itself is perfect.
| What the inspector must verify | The rule | Source |
|---|---|---|
| FNSKU label scans on the finished unit | 300 DPI, black on non-reflective adhesive paper, 1–2 in tall by 2–3 in wide; on extra packaging such as bubble wrap, the label goes on the outside | FBA prep requirements guide |
| No live legacy barcodes on cartons | “You must remove, cover, or render any existing barcodes on the outside of your shipping boxes. Use opaque tape or a black felt-tip marker to prevent incorrect barcodes from being scanned during receiving.” | FBA prep, packaging and labeling, retrieved 2026-09-07 |
| Poly bag thickness and seal | Minimum 1.5 mil, transparent, fully sealed, not extending more than 3 inches beyond the product | Bagging requirements help page, via the prep requirements guide |
| Suffocation warning present and legible | Required on bags with a 5-inch opening or larger, measured flat; print size scales off bag length plus width | Same page; point-size table in the prep guide |
| Carton weight and dimensions | Not over 36.00 in (L) × 25.00 in (W) × 25.00 in (H) or 50.00 lb total, unless the box holds a single oversize item above those limits | Shipping and routing requirements (G200141510), retrieved 2026-09-07 |
| Box content declared per box | Declared at box level, not shipment level; shipments without valid box content information attract a manual processing fee | How to ship to Amazon FBA |
Two of these deserve emphasis, because inspectors rarely volunteer them.
Scan, do not eyeball. Amazon requires an FNSKU on units not tracked by manufacturer barcode, in used condition, lacking a scannable manufacturer barcode, or that are media, restricted or dangerous goods, or consumable or topical (sell.amazon.com prep page above, retrieved 2026-09-07). “Label present” is not the test; “label scans, at printed size, through the bag” is. Ask for a handheld scan, photographed. Label mechanics are in the FBA labels guide, the identifier hierarchy in the barcode requirements guide.
Carton rules move. Amazon announced in its Seller Forums that the maximum box length for US FBA shipments would rise from 25 to 36 inches effective June 20, 2025, while Amazon Warehousing and Distribution kept the 25 × 25 × 25 inch envelope (Amazon-domain search snippets, 2026-09-07). A template written before that date, or for AWD, flags the wrong cartons. Copy today’s numbers into the brief rather than telling the inspector to “check Amazon’s carton rules.”
How AQL Sampling Actually Decides Pass or Fail
AQL — acceptance quality limit — is the mechanism nearly every inspection report uses, and it is routinely misdescribed as a quality score. It is not. It is a rule for deciding, from a sample, whether to accept or reject a lot.
The published sampling systems are ISO 2859-1 and its American counterpart ASQ/ANSI Z1.4. Both are sold, not published free. ISO’s catalogue lists ISO 2859-1:2026 as the current third edition, replacing the 1999 edition and its amendments and adding skip-lot procedures; ASQ sells ASQ/ANSI Z1.4-2003 (R2018), which ASQ describes as an acceptance sampling system with switching rules providing tightened, normal and reduced plans for attributes inspection (publishers’ catalogue listings, retrieved 2026-09-07).
No sampling table is reproduced here, and be suspicious of the ones that are. Those tables are copyrighted content of a paid standard, and the versions circulating on inspection-company blogs are unattributed reprints of unclear vintage — which now also means they predate the 2026 edition. Ask your inspection firm which edition and which inspection level its plan cites.
What you need to understand without the tables:
- Lot size sets sample size, not the other way round. You do not choose “inspect 200 units”: lot size plus an inspection level give a sample size code, which gives the sample size and the accept/reject numbers.
- The AQL number is your choice, per defect class. Practice splits findings into critical, major and minor, strictest on critical. The standard supplies the machinery, not the judgement of what is acceptable for your product.
- “Accept” is not “zero defects.” Accepting at any non-zero AQL means the plan tolerated defective units in the sample. If your listing cannot survive that rate in reviews, the AQL was set wrong, not the inspection.
- The defect classification is yours to write. For FBA, a missing suffocation warning or an unscannable FNSKU is a critical defect — it stops the shipment — where a generic inspector files it as minor cosmetic packaging. Say so before the visit.
The Three Pricing Models, and Why the Quotes Do Not Compare
Quotes for “Amazon FBA inspection” arrive in three incompatible units, so the first job is working out which service you are being quoted for. Every figure below is one named vendor’s own published rate on the date shown — none is an industry standard price, and each covers a different scope.
| Model | Priced by | What it typically covers | A published example (retrieved 2026-09-07) |
|---|---|---|---|
| Man-day | One inspector, ~8 hours on site | Factory PSI in the origin country: sampling, photo report | TradeAider publishes $199/man-day for pre-shipment inspection |
| Per-unit | Each unit handled | Destination prep-centre inspection, usually bundled with labelling | FbaZoom lists inspection “Starting at $0.35/standard unit” |
| Flat-rate per unit | Each sellable unit, all-in | Prep-centre receiving, inspection, labelling, bagging, shipment creation | FBAPrep4U quotes single-unit prep at $0.80 in one price-sheet form and $0.90 in another |
Three things follow, and they matter more than any number in the table.
A man-day rate and a per-unit rate are not competing bids. One buys a visit to a factory in China; the other buys handling at a US warehouse after the goods have already shipped. Comparing $199 to $0.35 is comparing a plane ticket to a postage stamp. Choose by where the goods are when you want the decision, then compare within that model.
Vendor-published market ranges disagree with themselves. The TradeAider page cited above gives a market range of “$199 to $320 per man-day” in one paragraph and “$149 to $320 per man-day” in another. Two figures, one page, one day. Treat any range published by a company that sells inspections as marketing, and price your job from named quotes.
The headline unit price is not the invoice. On the FbaZoom sheet, FNSKU labelling at $0.20/unit and compliant markings such as suffocation warnings at $0.20/unit/label each require the $0.35 inspection, so a bagged, labelled, warning-marked unit is a stack of line items. FBAPrep4U’s sheet carries a $50 minimum per invoice plus payment surcharges (PayPal $0.50 + 4%, credit card +3%, wire +$15). None of it is hidden; it is just not in the headline number.
Reading an Amazon FBA Inspection Quote: Five Questions That Change the Price
- Man-days, not visits. A large lot, multiple SKUs or a second city can turn a “one inspection” quote into two or three man-days. Ask how many are scoped, in writing.
- Travel surcharges. Rates that include travel within major manufacturing clusters may exclude everything outside them. Ask which clusters count.
- Re-inspection terms. If the lot fails, a second visit after rework is usually a second man-day. Confirm the rate and lead time before you need them.
- Report turnaround. Same-day photo report versus 48 hours decides whether you can still hold the balance payment on a finding.
- Who supplies the specification. If the answer is “we use our standard checklist,” you are buying a generic inspection with an Amazon-shaped gap in it.
Common Mistakes
- Booking the inspection after paying the balance. The report has no leverage once the money is gone — the same reasoning behind the sample-first gate in the how to start an Amazon FBA business guide.
- Letting the inspector define “defect.” Without a written classification, packaging failures that stop an FBA shipment get logged as minor.
- Assuming a prep centre replaces a factory inspection. Both have a place; neither substitutes for the other. The destination side is covered in the FBA prep services guide.
- Copying an AQL table off a blog. Unattributed reprints of a paid standard, now at least one edition out of date.
- Inspecting the product but not the carton. Weight, dimensions, box content and box labels fail shipments at receiving as reliably as a broken product does.
The Commissioning Checklist
Send all of this to the inspection firm before the visit, not after:
- Lot size, SKU count and packed-carton configuration
- Product specification with dimensioned drawings or an approved golden sample
- Written defect classification, with FBA packaging failures listed as critical
- AQL per defect class, and the inspection level, stated explicitly
- FNSKU label spec, plus an instruction to scan rather than eyeball and to photograph the scan
- Poly bag thickness, transparency, seal and suffocation-warning rules, including print size
- Carton weight and dimension limits, copied from Amazon’s help page that day
- Box content declaration and box label check
- Man-days scoped, travel inclusions, and the re-inspection rate
- Report format, turnaround, and balance payment held until it lands
Freight and customs sit downstream of a passed inspection; the shipping from China guide picks up there.
How These Sources Were Checked
Amazon’s Seller Central help pages render only with JavaScript and return a shell to automated retrieval, so three routes were used on 2026-09-07: the sell.amazon.com prep blog was fetched directly (HTTP 200) and is quoted verbatim, the shipping and routing requirements page (G200141510) was read from its headless-rendered text, and the box-length announcement came through Amazon-domain search snippets. Vendor pricing pages were fetched directly (HTTP 200) and are quoted as that vendor’s published rate on that date. Standards details came from the publishers’ catalogue listings; iso.org and the ANSI webstore both returned HTTP 403 to automated retrieval that day.
Frequently Asked Questions
What does a pre-shipment inspection for Amazon FBA actually check?
Whatever you specify. A generic pre-shipment inspection checks workmanship, function, quantity and packaging against your product specification. To make it an FBA inspection you add Amazon’s inbound rules — FNSKU scannability, poly bag thickness and sealing, suffocation warnings, carton weight and dimension limits, box content declaration — and classify failures on those items as critical defects.
How much does an Amazon FBA inspection cost?
There is no single figure, because three pricing models cover three different services. As of 2026-09-07, TradeAider published $199 per man-day for factory pre-shipment inspection, FbaZoom published inspection starting at $0.35 per standard unit at a destination prep centre, and FBAPrep4U’s price sheet showed single-unit prep at $0.80 and $0.90 in two forms on the same page.
What AQL should I use for Amazon FBA products?
The standard does not set it — you do, per defect class, and firms apply a house default if you do not. Set the level against what your listing can survive in reviews, keep critical strictest, and put FBA packaging failures in the critical class. The machinery is defined in ISO 2859-1 and ASQ/ANSI Z1.4; both are paid standards, and free tables online are unattributed reprints.
Is a prep centre inspection enough on its own?
Not if your concern is a bad batch. A destination prep centre inspects after freight has been paid and the goods have crossed an ocean, so its remedies are rework, return-to-vendor at your cost, or disposal. It is a reasonable last line for labelling compliance and a poor substitute for catching a manufacturing defect at the factory.
Can I skip inspection if I have used the supplier before?
A repeat supplier reduces the chance of a workmanship surprise but not of a packaging one. Amazon’s prep and carton rules change, and a factory that packed correctly last year is packing to last year’s brief unless you resend it.
Bottom Line
The value of a pre-shipment inspection is set by the brief you write, not by the firm you pick. Copy Amazon’s current published numbers into the inspection specification, classify packaging failures as critical, state your AQL per defect class rather than accepting a house default, and book the visit before the balance payment leaves your account. Then compare quotes only within one pricing model — a man-day at a Chinese factory and a per-unit rate at a US prep centre answer different questions, and the cheaper of the two is usually the one that would not have caught your problem.