A pre-shipment inspection (PSI) is one of the most effective risk-management tools available to buyers sourcing from China. For roughly $250–400, a qualified inspector spends a day at your factory checking a statistically valid sample of your production run before it ships — while the goods are still the factory's problem and your final payment is still leverage.
This guide covers the different types of inspection, when to book one, how AQL sampling actually works, what inspectors check, what it costs, and exactly how to handle a failed report. It is written for first-time importers, but the checklist discipline applies at any volume — and it is the last line of defence between your money and a container of goods you have not seen.
Why Pre-Shipment Inspection Matters
The alternative to a PSI is discovering quality problems after your goods have cleared Chinese customs — at which point every option is expensive and slow: rework in your own market, ship the container back, or accept and try to sell defective stock. Once you have paid in full and the goods have left China, your leverage is essentially gone.
A PSI moves the discovery point to before the money and the goods change hands. Done correctly, it converts a vague worry ("is this batch any good?") into an objective, third-party report you can put in front of the factory to demand rework — and it does so while you still hold the balance payment. That timing is the entire value of the exercise.
The Four Types of Inspection
"Inspection" is not one event. Depending on risk and order value, buyers use up to four checkpoints across a production cycle:
| Type | When it happens | What it catches |
|---|---|---|
| Pre-production (PPI) | Before mass production starts | Wrong materials or components before they scale into the whole run |
| During production (DUPRO) | Around 20–30% output | Process and quality drift early enough to fix mid-run |
| Pre-shipment (PSI) | 100% made, ≥80% packed | Full AQL check on finished, packed goods — the standard one |
| Container loading (LCC) | At loading | Right quantity, undamaged cartons, correct loading and count |
For a first order with a new supplier, a DUPRO plus a PSI is the highest-value combination: DUPRO catches a systemic problem while there is still time to fix it, and the PSI verifies the finished lot. For repeat orders with a trusted factory, a PSI alone is usually enough.
When to Book the Inspection
Timing is where inexperienced buyers lose the leverage they paid for. Schedule the PSI only once production is genuinely finished and at least 80% of the goods are packed into export cartons — inspect too early and the inspector cannot pull a representative sample or verify packaging and quantity. Give the inspection company several days' notice, and make the visit unannounced to the factory's own QC team where possible (the factory will know an inspection is coming, but they should not be able to hand-pick which day). Crucially, align the visit with your payment milestone: the report must land before your balance is due, or the whole point collapses.
Choosing an Inspection Company
The major third-party inspection firms operating in China include:
- Bureau Veritas (BV) — Global leader, broad product coverage
- SGS — Strong in consumer goods and food safety
- Intertek — Good coverage in textiles and electronics
- QIMA — Tech-forward, strong digital reporting, competitive pricing
- Asia Inspection / AsiaInspection (API) — Competitive rates, good Greater Bay Area coverage
For most independent buyers, QIMA or a comparable regional firm offer the best price-to-service ratio, typically billing per man-day. Bureau Veritas and SGS become the right choice when your own customer — a major retailer or a regulated channel — specifies a particular firm, or when you need a name your buyer already trusts on the report. Whichever you use, the inspector must be genuinely independent of the factory; an inspection arranged and paid for by the supplier is a marketing document, not a control.
What Is AQL Sampling?
AQL (Acceptable Quality Level) is the statistical sampling method used to decide how many units to inspect from a production run — and how many defects are tolerable before the lot is rejected. It exists because inspecting every unit of a large run is usually impractical, so you inspect a mathematically representative sample instead.
Defects are graded into three classes, each with its own AQL threshold:
- Critical (safety risk): AQL 0 — any critical defect fails the lot outright
- Major (significantly affects function or saleability): AQL 2.5 — the common threshold for general consumer goods
- Minor (cosmetic): AQL 4.0 — a looser allowance
The sample size and the accept/reject numbers come from a standard table (ANSI/ASQ Z1.4, equivalent to ISO 2859-1) based on your lot size, at General Inspection Level II:
| Lot size (units) | Sample size | Accept / reject at AQL 2.5 |
|---|---|---|
| 151–280 | 32 | Accept 2 / Reject 3 |
| 281–500 | 50 | Accept 3 / Reject 4 |
| 501–1,200 | 80 | Accept 5 / Reject 6 |
| 1,201–3,200 | 125 | Accept 7 / Reject 8 |
So on a run of 1,200 units, the inspector checks 80: find 5 or fewer major defects and the lot passes at AQL 2.5; find 6 or more and it fails. Agree these AQL levels with the factory in writing before production, so a "fail" is not a negotiation later.
What Inspectors Check
A standard pre-shipment inspection covers:
- Product appearance and workmanship
- Dimensions and weight against your specifications
- Quantity verification (an actual unit count)
- Packaging integrity and labelling accuracy
- Function and safety testing (for products with functional requirements)
- Barcode scanning (if applicable)
- Carton drop test and, where relevant, a bar/needle or moisture check
Some factories maintain in-house test facilities that supplement third-party inspection — leading LED manufacturers run LM-80 photometric testing on-site, while outdoor-furniture specialists operate UV and salt-spray chambers for weathering certification. That capability is a good sign, but it does not replace an independent check on the specific lot you are about to pay for.
Write the Inspection Checklist Before You Book
The single biggest factor in whether an inspection is useful is the brief you hand the inspector. A generic "check the goods" produces a generic report. Instead, prepare a one- or two-page checklist covering: your exact specifications and tolerances; a photo set of acceptable versus unacceptable quality for each likely defect; which defects you class as critical, major and minor; the function tests to run and their pass criteria; and packaging, labelling and barcode requirements. Reference a signed golden sample — the approved production sample both sides agreed to — and have the inspector compare the lot to it, not to a glossy prototype. The more specific the brief, the harder it is for a borderline lot to slip through, and the less room there is for the factory to argue the result.
Handling a Failed Inspection
If your report comes back a fail, work the problem in order:
- Do not release the balance payment — this is your only real leverage
- Read the report in full and understand exactly which defects failed, and at what rate
- Put the specific failures to the factory in writing, with the inspector's photos attached
- Agree a documented rework plan with a timeline and a named owner
- Book and pay for a re-inspection — the cost is trivial against shipping a bad lot
Most factories rework without much argument when the defects are documented by an independent inspector, because the report is objective and hard to dispute. Resist the common pressure to "release now and we'll fix it next order" — once the container ships and you have paid, that promise is unenforceable. The report is your evidence; use it while it still has value.
What It Costs — and Who Pays
A standard pre-shipment inspection runs about $250–400 per man-day, with large or complex lots needing more than one man-day. Re-inspections cost the same again. The buyer normally arranges and pays for the inspection precisely to keep it independent; some buyers negotiate that the factory bears the cost of any re-inspection triggered by a failed first check, which sharpens the factory's incentive to get it right the first time. Either way, treat inspection as a fixed line in your landed cost, not an optional extra — against a four- or five-figure order, a few hundred dollars of independent QC is one of the cheapest forms of insurance in the whole sourcing process. It also pairs naturally with an upfront factory audit and sound payment terms: audit before the first big order, inspect every shipment, and keep a balance payment tied to a passed report.
Common Mistakes That Waste an Inspection
Even buyers who pay for a PSI often undercut it. The frequent errors: booking too early, before the goods are packed, so quantity and packaging can't be verified; handing the inspector a vague brief and no golden sample, so a "pass" barely means anything; letting the factory pick the inspection date and quietly curate the sample pile; releasing the balance payment before reading the report because the ship date is looming; and treating one passed PSI as proof the supplier is permanently reliable, when quality can drift on the very next order. Each of these quietly hands back the leverage the inspection was meant to buy. Fixing them costs nothing — it is a matter of sequence and discipline, not extra spend.
How to Read the Report
A good inspection report opens with a clear overall result — pass, fail or pending — then the defect tally split into critical, major and minor against your agreed AQL, photographic evidence of each issue, quantity and packaging verification, and any function-test results. Read past the front-page verdict: a "pass" with a cluster of majors sitting just under the reject number is a warning about the next batch, and a "pending" usually means the inspector could not complete a check (goods unfinished, sample unavailable) and the visit needs rebooking. File every report — across a few orders they become a quality record that shows whether a supplier is improving or slipping, which is exactly the kind of first-party evidence a serious buyer keeps.
Frequently Asked Questions
How much does a pre-shipment inspection in China cost?
Typically $250–400 per man-day from third-party firms such as QIMA, SGS, Bureau Veritas or Intertek. Large or complex orders may need more than one man-day, and a re-inspection costs roughly the same again.
When should the inspection take place?
Once production is 100% complete and at least 80% of the goods are packed into export cartons, and always before your balance payment is due — that timing is what gives the report its leverage.
What does AQL 2.5 mean?
It is the acceptable quality level for major defects on general consumer goods. On a 501–1,200-unit lot the inspector checks 80 pieces; 5 or fewer major defects passes, 6 or more fails, per the ANSI/ASQ Z1.4 (ISO 2859-1) table.
Can I inspect the goods myself instead?
You can, but a trained third-party inspector applies AQL sampling consistently and produces a report the factory cannot easily dispute. If you can't attend, an independent inspector is far more reliable than trusting the factory's own QC on the lot you're paying for.
What happens if the inspection fails?
Withhold the balance payment, send the factory the documented failures, agree a rework plan, and book a re-inspection. Do not ship on a promise to "fix it next time" — once the goods leave and you've paid, that promise is unenforceable.
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