Product Inspection
Quality Control in China & Asia
What are the 6 Main Types of Product Inspection Service?
PPI
Pre-Production Inspection
A Pre-Production Inspection (PPI Inspection) is the next step after supplier identification and qualification, Generally, it’s conducted once raw materials are received, verify if the factory is able to begin production, and all the product specifications and quality requirements are understood.
DPI
During Production Inspection
During Production Inspection (DPI or DUPRO Inspection) is an on-site production inspection, also in-process inspection is performed when 20-50% of your production is completed and packed for shipping.
The DUPRO inspection ensures that all processes and products are being produced to the agreed standards and timeframes, also as a follow-up inspection with quality issues being found during a Pre-Production Inspection.
PM
Production Monitoring
AQI Service can send inspectors to stay at factories for weeks or months, monitoring production, confirming schedules, supervising internal quality control, randomly checking raw materials, semi-finished and finished products, and submitting daily detailed reports.
Starting when most materials arrive and production begins, it lasts until all goods are packed, focusing on high-risk stages. Covering quantity, workmanship, tests, checks, packaging, schedules and markings, it also offers customized plans.
PSI
Pre Shipment Inspection
The Pre-shipment Inspection or PSI inspection, also called Final Random Inspection (FRI), is to ensure the products have been manufactured match to the Clients specifications and packed ready to ship. It’s a quality control method to help you secure the quality of completed goods.
The Pre-shipment Inspection is a systematic inspection of samples randomly selected from the shipment, it usually will be performed when 100% of products have been completed and the order at least 80% packed.
DSS
Piece by Piece Inspections or Defect Sorting Service
Also known as 100% Inspection or Full Inspection, Defect Sorting Service (DSS) is a piece-by-piece screening of your entire order – or a large, targeted sample – to sort defective units from good ones. It’s typically used after a failed inspection, to rework a shipment before it leaves the factory, or whenever a buyer needs zero-defect confidence rather than a statistical sample. Inspectors check each unit against your agreed defect criteria and separate passed, reworked, and rejected items so you know exactly what’s shipping.
CLS
Container Loading Supervision/Inspection
Container Loading Supervision Service is also called Container Loading Inspection (CLI/CLS); the service is to ensure your finished goods are handled correctly as safe transportation when loaded into containers and shipped to the final destination, so the service is kind of cargo inspection before it loads into the container.
What Quality Issues Does Product Inspection Catch?
Most quality problems in overseas sourcing fall into a handful of recurring categories. Knowing what to look for helps you brief your inspector and set the right acceptance criteria.
- Sample-to-bulk deviation – The approved sample meets spec, but bulk production drifts from it as the order scales, especially on longer runs or with subcontracted output.
- Material substitution – Cheaper materials swapped in without approval, most common with metals, plastics, and fabrics when raw material prices shift.
- Cosmetic defects – Scratches, dents, uneven color, and surface finish inconsistencies that affect how the product looks on the shelf.
- Incorrect labeling and packaging – Wrong barcodes, missing warning labels, or packaging that doesn’t meet your destination market’s requirements.
- Dimensional and weight deviations – Products that fall outside the agreed tolerance for size, weight, or capacity.
- Functional failures – Electrical products that don’t power on correctly, mechanical parts that don’t fit, or items that fail basic safety or stress testing.
A structured inspection plan – Pre-Production Inspection, During Production Inspection, and Pre-Shipment Inspection – catches these issues at the stage where they’re cheapest and fastest to fix.
What is the Product Inspection Standard?
The inspections’ comprehensive criteria cover packing, packaging, labels, product function, performance, overall appearance, and dimensions.
We use the internationally recognized ANSI/ASQ Z1.4 (ISO 2859-1) statistical sampling procedure, ensuring that the inspected products are a representative sample, not an example that your supplier wants you to test. To determine the sample size and acceptance threshold, we use the international Acceptable Quality Limit (AQL) standard
What is Your Product Inspection Coverage?
AQI Service runs a dedicated QC network across China and South Asia, so inspections can typically be scheduled with as little as 24 hours’ notice – no matter which manufacturing hub your supplier is based in. Our coverage spans all major production regions in China (Guangdong, Zhejiang, Jiangsu, Fujian, Shandong, and beyond) as well as Vietnam, Thailand, India, Pakistan, Bangladesh, Cambodia, Indonesia, Malaysia, and Turkey.
Each inspection is guided by a working instruction built in our Operation Center around your specific product requirements – not a generic template – so the same standard applies whether your factory is in Shenzhen or Ho Chi Minh City. This local presence means shorter lead times, inspectors familiar with regional manufacturing practices, and consistent reporting no matter where your supply chain is spread across Asia. See our full QC network coverage →
What is Your Product Expertise?
Our inspectors bring category-specific expertise rather than a one-size-fits-all checklist.
For Softlines (garments, footwear, textiles, luggage & bags), we check stitching quality, colorfastness, fabric composition, and fit against your tech pack.
For Hardlines (toys, electronics & electrical, cosmetics, jewelry, eyewear), inspections extend to functional testing, battery and electrical safety, and drop or stress tests suited to each product type.
We also cover homeware, furniture, construction materials and i, with defect criteria built around the failure points specific to each category — not a generic form applied across every product.
Every inspector is briefed with a working instruction customized to your specifications before stepping onto the factory floor, so the checklist reflects your product, not a boilerplate template. Explore our full range of product expertise by industry →
Which Product Inspection Service Should You Choose?
By providing quality control services or product inspection services, AQI Service offers its clients a straightforward way to limit commercial risks when importing or exporting from China or Asia.
The product inspection services help you:
- Check if the quantity produced (finished and packed) matches the quantity ordered.
- Ensure visual appearance (color, finish) matches with the product ordered.
- Check if the product specifications (measurements, material, functions) comply with the order information.
- Verify packaging, labeling, instructions, and markings comply with mandatory standards
- Avoid recalls and reputational damage
- Anticipate production and shipment delays
- Optimize your quality control budget and supply chain
What Are the Best Inspection Options for Your Production Needs?
Theoretically, booking quality inspections at all stages of manufacturing will ensure maximum protection.
In order to save inspection costs, most buyers purchasing low to medium volumes will only choose to inspect at 2 or 3 steps of the production, (our most popular inspections are the During Production Inspection and the Pre Shipment Inspection).
We can work with you to help you determine the best option for your company.
What Should You Do If an Inspection Fails?
Note that ONLY YOU can accept or reject a shipment, so you get to decide how many defects are acceptable.
- You should study the product inspection report in detail and discuss results and future actions with your factory.
- You should also consider our defect sorting service on a specific sampling size or the full quantity.
How to Choose a Product Inspection Company?
Not all third-party inspection providers offer the same level of protection. Before booking, check for:
- Independence – Your inspector should have no commercial relationship with the factory. AQI Service works exclusively for the buyer, with no sourcing commissions or supplier kickbacks.
- Local coverage – Inspectors based near your factory schedule faster and understand regional manufacturing practices. AQI Service operates in all major manufacturing hubs across China and other Asian countries.
- Transparent, all-inclusive pricing – Know exactly what’s covered per man-day before you book. See our pricing and terms.
- Detailed, photo-documented reports – Every inspection should come with clear pass/fail criteria, defect photos, and measurements you can act on.
- Category expertise – Choose a provider with inspectors experienced in your specific product type. See the industries we cover.
Compliance & Regulations We Help You Navigate
Passing a visual and functional inspection is only part of getting a product to market. Depending on your destination, your goods may also need to meet chemical, safety, or labeling regulations:
- European Union – REACH compliance, RoHS compliance, CE marking, EN 71 for toys
- United States – CPSIA requirements for children’s products, CPC certification, FCC certification for electronics
- Food-contact and kitchenware – LFGB certification testing
AQI Service coordinates lab testing alongside your product inspection so test samples come from the same production lot, giving you one consistent view of both visual/functional quality and regulatory compliance. See our full product testing scope.
Frequently Asked Questions About Product Inspection
#1 What does a product inspection include?
A standard product inspection checks quantity, visual appearance, product specifications (measurements, materials, function), and packaging/labeling against your order requirements and, where applicable, AQL sampling standards (ISO 2859-1).
#2 How much does product inspection cost in China?
Pricing is calculated per man-day and depends on product complexity and order quantity. See our current pricing and terms or request a quote for an exact cost.
#3 How long does a product inspection take?
Most inspections are completed within a single working day (one man-day) per inspector. Larger or more complex orders may require multiple inspectors or additional days — we’ll confirm this when you book.
#4 Can I do product inspection myself instead of hiring a third party?
You can, but a third-party inspector brings independence, statistical sampling expertise, and no incentive to overlook defects – something factory self-inspection can’t offer. Most buyers combine occasional self-visits with regular third-party inspections for consistent, unbiased results.
#5 Which inspection service should I book if I can only afford one?
Pre-Shipment Inspection is the most common single-inspection choice, since it catches issues at the final stage before goods ship. For better protection at similar cost, most buyers pair it with a During Production Inspection.
All-inclusive pricing for inspections
Quality assurance specialists to ensure the inspection complete of transparency and integrity
Speed and Flexibility booking 24 hours prior to inspections
The Benefits from AQI Product Inspection Services
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