What pre-shipment inspection is for
Every earlier check in a program - the audit, the golden sample, the in-process controls - predicts quality; the pre-shipment inspection measures it, on the exact batch about to sail. Units are drawn at random from finished goods that are packed and ready, so the sample sees the product the customer will receive, including the box, the manual and the cable. The inspection answers one question with evidence: does this batch conform to the agreed specification, at an agreed sampling plan and acceptance level written into the purchase order? Everything else it produces - findings, photos, a rework list - follows from that framing.
The timing is as important as the tests. A proper inspection runs after production is complete and packed, and before the balance payment clears and the container loads. Run it earlier and it samples semi-finished stock that can still change; run it after loading and its findings arrive where they cannot be acted on. The sequencing is part of the desk's standing quality control workflow, and the schedule is confirmed in writing per program alongside the batch lead times on MOQ and lead time.
When it runs and what it samples
Sampling follows the plan agreed in the order - batch size, sample size and acceptance numbers for major and minor defects - rather than an inspector's judgement on the day. What counts as major versus minor is also written down before the batch: a handle that fails to charge is major by any definition, but whether a scuff on the shell underside is major or minor should be decided when the golden sample is signed, not argued at the warehouse. Toothbrush programs typically grade defects across three buckets: functional (charging, modes, timer, waterproofing), cosmetic (finish, gaps, print quality) and documentary (marks, manuals, barcode accuracy).
Sample size matters more than sample drama. A plan that draws enough units to judge the batch statistically also draws them across cartons - not the two pallets nearest the door - and the inspection report records which cartons were opened so the sampling can be repeated or audited later.
The functional checklist
| Check | Method on the floor | Conforms to |
|---|---|---|
| Vibration frequency and amplitude | Tachometer or jig reading against the model datasheet | Model specification |
| Mode switching | Cycle every mode on sampled units; confirm order and feel | Firmware sheet |
| Timer and quadrant prompts | Run a full session; time the two-minute stop and 30-second pulses | Golden sample behaviour |
| Runtime and charging | Discharge and charge sampled units; compare with the quoted figures | Datasheet and runtime report |
| Head insert and removal | Fit and pull sampled heads; check retention and rattle | Agreed force range |
| Button and switch life | Actuation cycling on a subsample | Agreed cycle count |
| Drop | Standard drops onto a hard surface per the order | Agreed drop spec |
| Tuft retention and appearance | Pull-test tufts; inspect finish, gaps and print | Golden sample and cosmetic standard |
Two habits raise the value of the functional block. Test against the datasheet, not against memory - the frequency figure written in the order is the only fair referee. And re-run borderline units rather than eyeballing them; a second reading settles most disagreements before they become findings.
Waterproof, safety and document checks
Waterproofing gets its own block because it is the category's defining failure mode. Sampled handles are submerged per the IPX7 routine - one metre for thirty minutes, the industry norm - then opened or function-checked after drying. The inspection also verifies the seal-critical details visually: charge port plugs seated, button membranes intact, head collar gaskets present. For lithium models the cell paperwork travels with the batch - UN 38.3 transport tests and IEC 62133-2 for the cell - and the inspection confirms the documents in the file match the cells actually packed, because a cell change mid-program is precisely the kind of discrepancy this block exists to catch.
Documents are checked as physical items too: the manual language matches the destination market, rating and marking text is present and legible, and certification markings printed on the product correspond to certificates that have been verified per project - the appliance route under IEC/EN 60335-2-52 or UL 859, radio approvals where Bluetooth is fitted. A marking on a box is a claim, and the inspection treats it as one.
Cartons, labels and shipping marks
The last functional object in the program is the master carton, and it is inspected like one. Shipping marks against the booking, carton quantity and per-carton count, barcode scans that read correctly at a scanner, and - where the program ships lithium handles - the battery marking applied as the freight rules require. Carton drop or stacking checks close the block for fragile finishes and retail-ready packs. This block costs minutes and prevents the two most common customs and forwarding delays: a mark that does not match the documents and a carton count that does not match the booking.
When findings fail: rework and re-inspection
A failing inspection is a decision point with three orderly exits: rework the affected units and re-inspect, downgrade or sort the batch if the agreement allows, or hold the shipment while the root cause is fixed. What the inspection should never become is a negotiation at the dock. The written acceptance plan decided in advance converts findings into actions, and the re-inspection confirms the action worked - which is why the desk schedules re-inspection time into the program calendar rather than treating it as an exception. Findings also feed forward: a repeating cosmetic defect found at inspection traces back to a molding or assembly station, and the fix belongs there, which is how inspection data improves the next batch instead of only judging this one.
Third-party eyes or the desk's own
Buyers choose between third-party inspection firms booked per batch and a sourcing desk that runs inspection as part of its standing workflow. The differences are practical: an inspector who knows the golden sample, the datasheet and the acceptance plan arrives with context, and a desk that inspected the previous batch arrives with memory. Either way the requirements are the same - random sampling across cartons, tests against written references, photographic evidence, and a report issued before the balance payment moves. A program that wants this workflow attached from the first quotation starts at the quote form; the audit that happens before the order is in the factory audit checklist, and what happens after loading is on logistics and shipping.