How to verify full factory inspection coverage
Verify coverage by reconciling the units presented with distinct inspected units, then tracing accepted goods into packing. Keep rejects and retests separate, and check original records for missing identifiers, duplicates and bypasses. Arrange an on-site coverage check with Cambridge China Bridge.
Define what full inspection covers
Ask the factory to identify the batch, product variants, inspection stage and checks performed on every unit. Separate visual checks, measurements and functional tests: inspecting every unit for appearance does not establish that every unit received a functional test. Record exclusions, including destructive tests, explicitly.
Use full inspection or sampling to choose the approach. This guide addresses a different question: whether the factory can demonstrate that the agreed checks reached every unit in the defined batch.
Reconcile physical units, not test events
Freeze the batch boundary before checking counts. Record opening stock awaiting inspection, additions, transfers out and closing uninspected stock. Reconcile the resulting population with distinct inspected units. Then reconcile those inspected units with their current status: accepted, rejected or awaiting a decision. Retests are extra events attached to existing units, not extra inspected units.
Count by variant as well as for the whole batch. Compare production records, inspection intake, physical stock and packing records. Explain scrap, test-consumed units and replacements separately. A matching total can conceal missing units offset by duplicate entries. Use batch and serial traceability to connect the records.
Keep rejects out of accepted stock
Walk the route from inspection to packing. Ask for clearly labelled, physically separate locations for uninspected, accepted, rejected and rework stock. Check who can move goods between them and how each movement is recorded. A reject label means little if rejected goods can return to the packing queue unchecked.
Keep the original failure record when a unit is repaired. Link the repair, retest result and release approval to that same unit. Reconcile the reject register with goods still held, scrapped or released after rework. Follow inspection failure corrective action for resolving the defects themselves.
Check records for repeats and bypasses
Request original inspection sheets and machine exports, rather than only a summary certificate. Ask for the unit identifier, batch, check performed, result, time, operator and equipment used. For measured tests, request actual readings and acceptance limits. Check the applicable settings and equipment checks using factory measurement checks.
Compare distinct unit identifiers with test-event totals. Investigate duplicate identifiers, missing records, implausibly short test intervals, identical readings and unexplained gaps. Ask to see aborted, failed and overridden events as well as passes. These are investigation signals, not proof of fabrication. Watch whether an operator can repeat a known good unit or send an untested unit directly to packing.
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Challenge coverage before release
Have a checker choose goods from packed cartons, different variants and the start and end of the batch. Trace each selected unit back to its inspection evidence, then select entries from the records and locate the corresponding goods or recorded disposition. Observe a live run, including how failed tests, interruptions and rework are handled. Spot checks can expose gaps but cannot establish full coverage alone.
Where individual serials are unavailable, agree controlled tray or carton identities, fixed unit positions and recorded transfers before inspection. This provides weaker evidence if goods can be mixed. Ask for a release pack containing the count reconciliation, original results, reject dispositions and packing link. Hold release under your agreed process until unexplained differences are resolved; if coverage cannot be reconstructed, arrange a controlled repeat inspection.
Frequently asked questions
Does a full inspection certificate prove every unit was checked?
A certificate alone does not establish coverage. Ask for the defined batch, distinct unit count, original results, reject dispositions and a link to the packed goods.
Can retesting inflate the inspected quantity?
Yes. A repaired unit may generate several test events. Count distinct physical units separately and retain each unit's failed and repeated tests.
What if products have no serial numbers?
Agree controlled tray or carton identities and unit positions before inspection. Track transfers and prevent mixing. If that chain breaks, treat coverage as unverified.
What should I do if inspection counts do not match?
Ask for a reconciliation of additions, transfers, scrap, rejects, retests and packed stock. Hold release under the agreed process until gaps are explained or a controlled repeat inspection is completed.