A counter-sample is a duplicate of a sample, sealed and kept as a reference. One counter-sample is kept from the sample you approve, and another from each production lot before it ships.
You keep it because memories and photos are poor evidence. If a later lot looks different, or a customer complains, the counter-sample lets you compare the goods against the real thing.
Two kinds of counter-sample
- The approval counter-sample is a sealed duplicate of the sample you approved. It is the standard every future lot is judged against.
- The lot counter-sample is drawn from the finished lot at inspection. It shows what actually left the factory.
How a counter-sample should be kept
A counter-sample only works as evidence if nobody can say it was swapped or spoiled. It should be sealed in front of the inspector and labelled with the product, the lot number, the date and a code. Ideally, the factory signs or stamps the seal too, so it cannot later deny the sample came from its goods.
Store it in conditions that do not change it. Food and agricultural goods need cool, dry, dark storage, and some will not stay stable for long. Fabrics, ceramics and metal goods keep better, but still need protection from light and damp. Keep it at least until the goods are sold and any claim period has passed.
Who holds it matters. A sample held only by the factory is weak evidence for you. We keep sealed counter-samples ourselves, separate from the factory.
How it helps in a dispute
Suppose a container arrives and your customer says the colour is off or the moisture is high. You can send the lot counter-sample to a laboratory and test it against the same spec. If the counter-sample passes and the arrived goods fail, the problem may have arisen in transit or storage. If both fail, the factory shipped an off-spec lot.
The approval counter-sample helps with slow drift. Quality often slips a little with each order, and nobody notices until it is far from the original. Comparing a new lot with the approval sample shows the drift clearly. Our guide on why quality drops after the first container explains the pattern.
When a lab test is involved, reading the lab certificate properly is the next step.
Write it into the contract
Counter-samples carry more weight when the purchase contract mentions them. State that a sealed counter-sample will be drawn from each lot at inspection, who will hold it, and how long it will be kept. Say that a test on the counter-sample by an agreed laboratory will settle a quality dispute.
With that clause in place, the factory knows from the start that every lot can be checked later. That alone discourages quiet substitutions. It also gives both sides a fair, agreed way to settle a disagreement, instead of an argument over photos.
Next step
Counter-samples are part of every order we manage, from sampling to loading. To set this up for your product, book a free sourcing review.