Last updated on August 1st, 2026 at 01:10 am
Direct answer: A During Production Inspection (DUPRO) checks quality when 20–60% of your order is finished, so defects can be corrected before the whole batch is affected. A Pre-Shipment Inspection (PSI) checks the finished, packed goods when at least 80% are complete, acting as the final gate before you pay the balance and ship. DUPRO prevents problems; PSI catches them. For orders above roughly $15,000, new suppliers, or custom products, booking both is the safest and usually cheapest strategy overall.
Many importers only book a pre-shipment inspection — then discover a systemic defect when 100% of the goods are already produced and the ship date is a week away. At that point your options are bad: accept defective goods, pay for rework and miss your launch, or abandon the order. This guide explains exactly what DUPRO and PSI cover, what they cost, and how to decide which one (or both) your order needs.
Table of Contents
- What Is a During Production Inspection (DUPRO)?
- What Is a Pre-Shipment Inspection (PSI)?
- DUPRO vs PSI: Side-by-Side Comparison
- What Inspectors Actually Check
- Costs and Timing
- Decision Framework: Which Do You Need?
- Practical Examples
- Common Mistakes
- Expert Recommendations
- FAQ
What Is a During Production Inspection (DUPRO)?
Definition: A During Production Inspection (also called DPI or in-process inspection) is an on-site quality check performed while manufacturing is underway — ideally when 20–60% of units are completed. The inspector examines finished and semi-finished units against your specification, checks materials and components, and reviews the production line and schedule.
The strategic value of DUPRO is early correction: if a color is off, a component is wrong, or a stitching process is producing defects, the factory can fix the root cause while most of the order is still unmade.
What Is a Pre-Shipment Inspection (PSI)?
Definition: A Pre-Shipment Inspection is a final random inspection performed when at least 80% of the order is produced and packed. Using AQL sampling standards, the inspector pulls a statistically valid random sample from packed cartons and checks workmanship, function, packaging, labeling, and quantity against your purchase order.
PSI is the industry-standard gate before paying the 70% balance: the report gives you objective evidence to approve shipment, demand rework, or negotiate before the goods — and your leverage — leave the factory.
DUPRO vs PSI: Side-by-Side Comparison
| Factor | During Production (DUPRO) | Pre-Shipment (PSI) |
|---|---|---|
| Timing | 20–60% of units completed | ≥80% completed and packed |
| Main purpose | Catch and correct defects early | Final approval before payment/shipping |
| Sample basis | Units produced so far + line review | AQL random sample from packed cartons |
| Can factory still fix issues? | Yes — at low cost | Only via rework; delays shipment |
| Checks packaging & labeling | Partially (samples if available) | Yes — full export packing check |
| Verifies production schedule | Yes — flags delays weeks early | No — too late to recover delays |
| Typical cost (third-party) | $250–$320 per man-day | $250–$320 per man-day |
| Best for | Custom/OEM products, new suppliers, large orders | Every order, especially before balance payment |
What Inspectors Actually Check
During a DUPRO
- Raw materials and components match approved samples (fabric weight, plastic resin, PCB version)
- Workmanship on completed units against the defect classification list
- Critical dimensions and functions on a pulled sample
- Production pace vs contract schedule — a factory at 15% completion two weeks before shipment is a red flag
- In-line QC practices: does the factory inspect its own output?
During a PSI
- Quantity count of packed export cartons
- AQL-based random sampling (commonly Level II, 2.5 major / 4.0 minor)
- Function, safety, and performance tests per product type
- Packaging drop tests, barcode scans, labeling and marking compliance
- Carton weights/dimensions vs packing list — critical for FBA and retail routing
Costs and Timing
| Scenario | Inspection Plan | Typical Cost | Risk Coverage |
|---|---|---|---|
| Repeat order, proven supplier, standard product | PSI only | $250–$320 | Good |
| New supplier, standard product | DUPRO + PSI | $500–$640 | Strong |
| Custom/OEM product, any supplier | DUPRO + PSI | $500–$640 | Strong |
| High-value or regulated product | DUPRO + PSI + lab testing | $800–$1,500 | Maximum |
Put the numbers in context: on a $20,000 order, adding a DUPRO costs about 1.5% of order value. A systemic defect discovered only at PSI typically costs 10–30% of order value in rework, air-freight recovery, or lost sales.
Decision Framework: Which Do You Need?
- Is this a custom or private-label product? Book DUPRO + PSI. Custom tooling and processes fail in ways catalogs don’t.
- Is the supplier new to you? Book DUPRO + PSI, even for standard goods — you have no defect history to rely on.
- Is the order above $15,000 or business-critical (seasonal launch, retail PO)? Book both; schedule risk alone justifies the DUPRO.
- Repeat order from a supplier with 2+ clean PSI reports? PSI only is a reasonable economy.
- Very small order (<$3,000)? At minimum, request detailed photos/video at 50% production and book a PSI if margins allow.
Expert tip: tie payments to inspection results in your purchase contract — for example, “70% balance payable upon passed pre-shipment inspection report.” This single clause converts your QC report into real negotiating power.
Practical Examples
- Custom silicone kitchenware, new factory ($28,000): DUPRO at 35% completion found mold flash on 12% of units. The factory adjusted the molds the same week; the later PSI passed at 0.8% minor defects. Estimated saving: $6,000+ in rework.
- Bluetooth speakers, repeat supplier ($12,000): buyer skipped DUPRO after two clean orders. PSI found a firmware regression affecting pairing on 100% of units — caught before shipment, fixed by re-flashing in 4 days. PSI alone earned its fee 40 times over.
- Apparel brand, 8,000 hoodies: DUPRO at 30% caught shade variation between dye lots. Factory re-dyed affected panels; shipment left on time. A PSI-only plan would have found the problem with all 8,000 pieces finished.
Common Mistakes
- Booking only PSI on custom products. By the time PSI runs, 100% of tooling-driven defects are baked into the batch.
- Letting the factory pick the inspection date. Factories sometimes call for PSI at 50% completion so the “random” sample comes from their best units. Insist on ≥80% packed.
- Vague specifications. An inspector can only check against what you define. Provide an approved sample, spec sheet, and defect classification before booking.
- Paying the balance before reading the report. Payment is your only real leverage; release it after a passed PSI, not before.
- Treating a passed PSI as a legal guarantee. AQL sampling is statistical — it manages risk, it doesn’t eliminate it. Combine inspections with supplier vetting and contracts.
Expert Recommendations
- Default plan for serious orders: DUPRO at 30% + PSI at 80% packed, with payments tied to the PSI result.
- Use ANSI/ASQ Z1.4 AQL sampling (Level II, 2.5/4.0) unless your category demands tighter limits.
- Share the full inspection checklist with your supplier before production starts — surprises benefit no one.
- For regulated categories (electronics, toys, food-contact), add lab testing to inspections; import requirements are summarized by the International Trade Administration.
- If a DUPRO fails, require a corrective action plan with a re-inspection — don’t accept “we will fix it” verbally.
Woosourcing performs DUPRO and pre-shipment inspections across China with bilingual QC engineers and same-week reporting — learn more about our inspection and extra services.
Frequently Asked Questions
What is the difference between DUPRO and pre-shipment inspection?
DUPRO happens mid-production (20–60% complete) to catch and correct defects early, while pre-shipment inspection happens when at least 80% of goods are finished and packed, serving as the final quality gate before payment and shipping.
When should a during production inspection be scheduled?
The sweet spot is 20–60% completion — early enough that most of the order can still be corrected, late enough that real finished units exist to inspect. For custom products, 30% is a common target.
How much does a China product inspection cost?
Third-party inspections in China typically cost $250–$320 per man-day all-inclusive. Most single-SKU orders under 5,000 units need one man-day per inspection type.
Do I need both DUPRO and PSI?
Book both for custom products, new suppliers, or orders above roughly $15,000. For repeat orders of standard products from proven suppliers, a PSI alone is usually sufficient.
What AQL level is used for pre-shipment inspections?
The most common standard is ANSI/ASQ Z1.4, General Inspection Level II, with acceptance limits of 0 critical, 2.5 major, and 4.0 minor defects.
Can the factory refuse a third-party inspection?
Legitimate factories accept inspections routinely. Refusal — or repeated rescheduling — is a serious red flag suggesting subcontracting, quality problems, or in the worst case a scam operation.
What happens if a pre-shipment inspection fails?
You typically require the factory to sort and rework the batch, then pay for a re-inspection. Because the balance payment is still in your hands, factories almost always comply. Never release payment against a failed report.
Conclusion
DUPRO and PSI are not competing options — they answer different questions. DUPRO asks “is this order going wrong while we can still fix it?” and PSI asks “should I pay and ship?” Skipping the first turns small process errors into batch-wide losses; skipping the second means paying for goods you have never verified. For custom products and new suppliers, the $250–$320 cost of adding a DUPRO is the cheapest insurance in China sourcing.
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