A pre-shipment inspection is the cheapest insurance in international trade: a few hundred dollars to find out whether thousands of dollars of goods match what you ordered — while you still have leverage to fix problems. This guide explains how inspections work, what AQL actually means, and how to build inspection into your ordering process.

What a PSI is and why it has leverage

A pre-shipment inspection (PSI) happens when production is complete and at least 80% of goods are packed, before the balance payment is released and the goods ship. An inspector visits the factory, checks a statistical sample against your specification, and issues a pass/fail report the same or next day.

The timing is the point: inspect before paying the balance and the supplier has a strong incentive to fix problems; discover defects after the container lands and your remedies shrink to goodwill and lawsuits. The standard payment structure — 30% deposit, 70% after passed inspection — exists precisely to preserve this leverage.

What inspectors actually check

A standard PSI covers:

  • Quantity — cartons and units counted against the PO.
  • Workmanship — visual defects across the sample, classified as critical, major or minor.
  • Conformity — product specifications: dimensions, weight, materials, colours against your approved (golden) sample.
  • Function and safety tests — category-appropriate on-site checks: electronics function tests, garment seam strength, drop tests, barcode scans.
  • Packaging and labelling — retail packaging, shipping marks, carton strength, regulatory labels.

You define the checklist. The more precise your specification and golden sample, the more an inspection protects you — inspectors verify against what you documented, not what you imagined.

AQL: how sampling works without checking every unit

Inspections use AQL (Acceptance Quality Limit) sampling under ISO 2859-1: a statistically chosen sample size based on your lot size, with defect thresholds that trigger pass or fail. The common consumer-goods standard is AQL 0/2.5/4.0 — zero critical defects tolerated, up to 2.5% majors, 4.0% minors.

Practical example: for a 5,000-unit order, general inspection level II yields a sample of 200 units; the shipment fails if inspectors find any critical defect, more than 10 majors, or more than 14 minors. Tighten the AQL (e.g. 1.5 majors) for premium products; the inspection costs the same, the bar just rises. Specify your AQL in the purchase order so the factory knows the target before production, not after.

Booking, costs and logistics

Third-party inspections cost roughly $200–$350 per man-day in most Asian manufacturing countries, and most consumer-goods PSIs fit in one day. The global firms (SGS, Bureau Veritas, Intertek, TÜV, QIMA) and credible regional agencies all offer online booking — provide your PO, specification, golden-sample photos and checklist, give the factory 3–7 days' notice, and require your supplier's confirmation that goods will be 80%+ packed on the date.

Expect some factory pushback or rescheduling — mild resistance is normal; repeated date-slipping right before inspection is a signal worth taking seriously.

When the inspection fails

A failed report is leverage, not disaster — handled well, it usually ends with fixed goods. The sequence: share the report with the supplier and ask for a corrective-action plan with dates; for workmanship failures, sorting and rework is normally feasible — agree it, then book a re-inspection (often at a discounted rate); hold the balance payment until the re-inspection passes; and document everything in writing for the relationship record.

If defects are fundamental (wrong materials, spec misread), the conversation is harder — partial refund, discount, or remake — and your negotiating position is exactly as strong as your payment structure. This is why the balance must never be paid before inspection.

Beyond PSI: the full inspection toolkit

For higher-stakes orders, layer in: initial production checks (first units off the line — catches systemic errors when 2% of the order is affected, not 100%), during-production (DUPRO) inspections at 20–50% completion, and container loading checks (right goods, right quantity, sound loading, sealed container). A reasonable rule of thumb: every new supplier and every first production run gets a PSI minimum; add upstream checks when order value, customisation or deadline risk justifies them. Suppliers.PRO's verification tiers include optional on-site inspection by independent partners, surfaced as badges on supplier profiles — sign up for early access.