Buying products from overseas factories always comes with some risk. You can’t see the goods with your own eyes until they arrive at your door, and by then, it’s often too late to fix a problem. That’s why quality control inspections exist. They give you a set of eyes on the ground, checking your order before it ships.
But there’s more than one type of inspection, and each one serves a different purpose. Two of the most common are the During Production Inspection (DPI) and the Final Random Inspection (FRI), also known as a pre-shipment inspection. Buyers often ask which one they actually need.
The honest answer is that both play a role, just at different points in the process. Here’s how they compare, and how to decide which fits your order.
What Is a During-Production Inspection?
A During-Production Inspection, often shortened to DPI or called a DUPRO inspection, happens while your order is still being made. According to Jonble, this check takes place once 10% to 60% of the product has been manufactured and is being packaged for export. It’s also sometimes called a During Production Check (DPC).
The idea behind DPI is simple. Instead of waiting until the very end to find out something went wrong, you catch problems early, while there’s still time to fix them. If an inspector spots a defect at this stage, your factory can correct it before it repeats across the rest of the order.
During a DPI, inspectors sample the goods on site and test them against the internationally recognized ANSI/ASQC Z1.4 (ISO 2859-1) standard. A full quality assessment follows.
What a DPI Checks
A during-production inspection typically covers:
- Workmanship
- Production situation
- Quantity of finished products
- Style and colors
- Artwork and labels
- Dimensions and weight
- Shipping marks
- Packing and packaging
- Product function, performance, durability, and safety tests
- Any specific requirements you’ve set as the buyer
What Is a Final Random Inspection?
A Final Random Inspection, or FRI, is better known in the industry as a Pre-Shipment Inspection (PSI). This one happens much later. It’s carried out on site, either at the factory or at the forwarder’s warehouse, once your order is at least 80% complete and packed.
Think of it as the last checkpoint before your goods leave China. The inspection team randomly samples close to the finished shipment to see if it’s ready to go. Because it comes right before loading, it’s your final chance to catch issues and decide whether to approve the shipment or ask for corrections.
Like the DPI, the FRI is measured against the same ANSI/ASQC Z1.4 (ISO 2859-1) standard, with random sampling and a full assessment of the selected units.
What an FRI Checks
A final random inspection generally looks at:
- Workmanship
- Quantity
- Style and colors
- Artworks and labels
- Dimensions and weight
- Shipping marks
- Packing and packaging
- Product function, performance, durability, and safety tests
- Any specific requirements you’ve set as the buyer
Key Differences Between DPI and Final Random Inspection
The two inspections share a lot of the same checklist. The real difference comes down to timing and purpose.
- When it happens: DPI takes place at 10% to 60% completion. FRI happens at 80% completion or later, once goods are packed.
- What you can still change: During a DPI, there’s still production left to run, so corrections can be applied to the rest of the order. During an FRI, the order is nearly done, so this check is mostly about approving or rejecting the shipment as it stands.
- Production situation: DPI includes a check on how production is progressing. FRI does not, since the goods are already finished by that point.
- Purpose: DPI is about catching and fixing defects early. FRI is about confirming the finished goods are ready to ship.
In short, DPI is a course correction. FRI is a final gate.
How AQL Sampling Fits Into Both
Both inspections use AQL, or Acceptable Quality Limit, sampling. Instead of checking every single item, inspectors pull a random sample based on your total order size and inspect that sample closely.
Jonble uses general inspection Level II for most orders, since it’s the standard and most widely used option. For example, an order of 12,000 items at Level II calls for a sample size of 315 units.
Defect levels range from 0 to 6.5, and buyers choose the acceptable rate for critical, major, and minor defects. Most importers go with the standard 0/2.5/4 defect levels.
Using that standard with a sample size of 315 units, a shipment should be rejected if it has:
- More than 0 critical defects
- More than 14 major defects
- More than 21 minor defects
Higher-risk products, like those in the automotive category, sometimes use stricter levels such as 1/1/1 or 0/1.5/2.5.
Which One Should You Choose?
For most buyers, this isn’t really an either-or decision. The two inspections work best together, not as substitutes for one another.
Choose a DPI if you’re working with a new factory, producing a large order, or making a product where defects tend to show up mid-process. Catching issues at 10% to 60% completion gives your supplier time to fix the problem before it spreads across the whole batch.
Choose an FRI (pre-shipment inspection) for every order, regardless of whether you’ve already run a DPI. It’s your last checkpoint before goods leave the factory, and it tells you whether the finished, packed shipment is actually ready to load.
If your budget only allows for one inspection, an FRI is the minimum most buyers rely on, since it checks the finished product. But for new suppliers, complex products, or larger orders, adding a DPI earlier in the process reduces the risk of finding a widespread problem too late to fix.
Why Work With Jonble
Jonble has over 16 years of experience running inspections across China and has worked with more than 1,000 verified clients. The team covers all provinces and cities in China, including Zhejiang, Shanghai, Jiangsu, Guangdong, Ningbo, and Shenzhen, so wherever your factory is, coverage isn’t a problem.
The process is straightforward. You reach out with your requirements, and Jonble responds within 24 hours. Once the inspection is booked, it’s typically scheduled within a week, and you’ll receive your detailed report within 24 hours of the inspection taking place.
If you want to see what a report looks like before you commit, Jonble can share a sample report free of charge.
Summary
A During Production Inspection catches problems early, while there’s still time to fix them. A Final Random Inspection checks your finished, packed goods right before they ship. Both are measured against the ANSI/ASQC Z1.4 (ISO 2859-1) standard using AQL sampling, but they serve different moments in your production timeline.
For most orders, using both gives you the strongest protection, but the FRI is the one checkpoint you shouldn’t skip.
If you’re not sure which inspection fits your order, Jonble’s team can walk you through it based on your product, factory, and timeline.
Get in touch:
- Phone / WhatsApp: +86 133 2613 5867
- Email: service@jonble.com
- Website: jonble.com/contact