During a production line visit, check the current specifications and approved sample first, then follow the product through materials, line setup, workmanship, measurements and tests, traceability, and packing and labelling. At each stop, compare what is happening with the agreed requirement and record the units, stations and conditions checked. Include barcode scanning where it is in scope.
A line visit shows the operations available on that date; it is not automatically an acceptance inspection or a full factory audit. When booking an inspection alongside the visit, our published service windows are about 5–10% production complete for initial production inspection [1], 30–50% finished for during-product inspection [2], and 100% produced with at least 80% packed for final random inspection [3].
| Inspection window | Checks to prioritise |
|---|---|
| About 5–10% complete | Materials, setup and early output |
| 30–50% finished | Work in progress, process consistency and emerging defects |
| 100% produced with at least 80% packed | Finished quantity, workmanship, labels and packing |
We are UTS, a third-party inspection company. Our team handles product inspection, factory audit, supplier evaluation and laboratory testing coordination. We match what is on the line against your specifications, your approved sample and the agreed checklist, and we put what we find in the report. Shipment, approval and production decisions stay with you and your supplier.
Our team adapts the checklist to the product and specification rather than using one fixed list. In our published inspection workflow, softlines checks cover measurements, stitching and appearance, while hardlines checks include construction, stability and finish. We record the models, colours and sizes sampled, quantities checked, actual measurements and defect evidence, and we identify documents, tests or areas that were unavailable. This product-specific approach is described on the UTS inspection service overview.
Our reports present actual findings only. They do not contain recommendations, corrective-action plans, or shipment-release advice. The preparation guidance in this article is separate from report content.
Reference Documents
Before the visit, confirm the current drawing or specification revision, bill of materials, approved sample identity, packing files and agreed checklist. Our sample evaluation checks samples against drawings, specifications and design documents before they serve as a reference [4]. If the sample is unavailable or a revision is unclear, record the gap and identify which checks lack a confirmed reference; other checks with clear requirements can still be recorded.
On the line, confirm with the factory which SKUs, colours, sizes and order quantities are running, and how far the order has progressed.
Materials and Components
On the line, check the materials, parts and packaging staged for this order against the approved parts list and the material needs for the SKUs in production.
- Part identity and version: correct part numbers, grades, colours and component versions, with approved swaps kept apart from unapproved changes
- Material condition: dry, clean and undamaged stock, sound storage, and first-in-first-out rotation where the supplier uses it
- Incoming evidence: incoming records or test reports for the agreed checks are on hand, and the lot or batch traces back to the staged stock
Appearance alone cannot confirm a plastic or metal grade. Check the material identity and supporting records; where those do not establish the required property, agree whether laboratory confirmation is needed.
Line Setup and Process Flow
Walk the line in station order and check tooling, fixtures and programmes against this product and revision. After a changeover, look for leftover parts, labels or instructions that could be confused with the current order.
Note the flow for this product, from incoming staging through its forming, assembly, finishing, testing and packing steps. Keep rework, repair and sorting areas apart from normal flow, so untested or reworked units cannot re-enter the line without a record.
Use the process approach described in the ISO quality management framework as context for comparing documented controls with actual practice [5]. Where an agreed process-control review is in scope, our team checks the relevant procedures and records against observed practice [6]. For settings such as temperature, pressure, cure time, torque or machine programmes, record the value, unit, station and applicable requirement. Distinguish a displayed setpoint from an independently measured result; we do not adjust the settings.
In-Process Workmanship
Check work in progress at several stations rather than only finished units. For example, observe adhesive application at bonding and joint condition after assembly. Record the station and unit identity for each finding; observations from different units do not, by themselves, establish where a defect began.
Coverage follows the product and the agreed scope. Stitching, welding, fastening, bonding, edge finishing, coating coverage, alignment, fit of mating parts and the action of controls or moving parts may all fall inside it. Judge each point against the approved sample and the written defect definitions. For a hypothetical 10,000-unit order, 5–10% means 500–1,000 units are built. Use that math to set the visit window; do not treat it as the inspection sample size.
Defect Records
| Record this | Why it matters |
|---|---|
| Defect description | Names the failure |
| Location on the unit | Pins down the spot |
| Unit identity | Links the finding to one unit |
| Requirement concerned | Gives the rule used for the call |
For a formal acceptance inspection, define the lot and sampling plan separately from the line walkthrough. Acceptance sampling uses a random sample to support a decision about the lot; it is not primarily a method for estimating lot quality [7]. A few units shown during a visit are not a substitute for that sample, and a sample result does not establish that every unit is defect-free.
Classify each defect as critical, major or minor under the agreed criteria, following the three levels described in our defect classification guide [8].
Measurements and Tests
Ask what the line measures and tests, how often, on how many units, and with what gear. Then watch whether practice matches the plan, and note the drawing revision and tolerance behind each check.
- The points, units, tolerances and method match the current drawing or specification
- Gauges, calipers and test fixtures are identified, with calibration or verification records appropriate to their use; calibration supports measurement quality, but a label alone does not establish that a method suits the check [9]
- Test conditions go on the record when they shape the result, such as test time, load, voltage, temperature or cycles
- Failed units are marked, kept apart, and retested under the agreed rule instead of returning without a record
Laboratory Confirmation
Visual line checks cannot establish every safety, chemical or performance requirement. Depending on the product and destination, separate testing may be needed for restricted substances, flammability, food-contact migration or electrical safety. ISO/IEC 17025 addresses laboratory competence and valid results; a line visit is not evidence of laboratory accreditation [10].
For RoHS-related checks, identify relevant homogeneous materials and applicable exemptions; do not assume the same assessment applies to every restricted-substance requirement. Our CE, RoHS and REACH testing coordination helps define the product-specific work [11]. Confirm sample identity, test scope and result dates. For food-contact migration, confirm material, intended food, contact time and temperature, and destination market through our food contact testing coordination [12].
Traceability and Handling
On the visit, check that units, batches and cartons trace from incoming stock, through the line, to packed goods. Check date codes, lot or batch marks, traveller cards or system records where the supplier uses them. The marking method should suit the product and the agreed scope.
Parts should travel between stations without scratches, dirt, moisture, static damage or dents, and work-in-progress bins should carry a status mark. Mixed, unlabelled or overfilled bins let the wrong part or wrong version move downstream unnoticed, so check bin marking by status at each handover.
If the supplier swaps, tops up or moves units during the visit, write down the quantity, identity and reason.
Packing and Barcodes
Where packing is in scope, check the carton, inner box, cushioning, seals, assortment, count per carton and shipping marks against the packing files and the destination needs.
Barcode Scanning
For barcodes and QR codes, read the human-readable detail against the order data first, covering model, version, quantity and destination identifiers, then scan the codes. Where barcode or QR-code scanning is in the agreed scope, our requirement is 100% scan success on the checked codes using the agreed scanner type, scan distance and lighting conditions, with the encoded data matching the approved code content. This 100% applies to the checked codes under those conditions; it does not mean the whole lot was scanned and does not guarantee readability on every downstream device [13].
Record the code type, equipment and conditions, number of codes checked, and any unreadable or mismatched codes. If the specification requires a unique serial code, record duplicates; a shared product or batch code is not a duplicate-serial defect merely because it appears on multiple units.
Line Conditions and Open Points
On the line, check that stations have enough light, a clean floor without stray objects, nonconforming units kept apart, and current work instructions where the work happens. Where a factory evaluation or quality management system audit is in scope, our team checks the relevant procedures and records against what people actually do, following audit guidance on principles, audit programmes and conducting audits [6][14][15].
Before leaving the line, list what stayed out of sight: missing records, idle stations, SKUs not running, tests not watched, and samples sent off for laboratory testing. Name each open point in the record.
Close the Visit
Before leaving, reconcile the coverage with the agreed checklist: which SKUs and stations were available, how many units were checked, what results were recorded, and which checks could not be completed. Separate a test that failed from a test that was not performed.
Our reports describe the agreed scope, the units and stations covered, measurements and test outcomes, observed defects and any unfinished or excluded checks. They do not include corrective-action or release recommendations. The buyer and supplier use those findings, with the contract and applicable requirements, to decide containment, rework, re-inspection or shipment.
As general planning guidance, you can choose a during-product inspection for checks during production, a factory evaluation or system audit for supplier capability and controls, or a final random inspection for the finished lot. Laboratory testing addresses requirements outside the agreed on-site methods. Where every unit needs checking for specified points, our full inspection examines each unit in the batch for those agreed points, not every possible defect [16]. These service options are not recommendations in our findings report.
Planning a production line visit? Send your product, factory address and target date.
Our team will confirm whether a line visit, during-product inspection or final random inspection fits your question.
References
- UTS Initial Production Inspection — https://www.utsinspection.com/initial-production-inspection.html (accessed 2026-11-04; supports: early-production check at about 5–10% completion)
- UTS During Product Inspection — https://www.utsinspection.com/during-product-inspection.html (accessed 2026-11-04; supports: mid-production checks, normally when 30–50% of goods are finished)
- UTS Final Random Inspection — https://www.utsinspection.com/final-random-inspection.html (accessed 2026-11-04; supports: finished quality, quantity, packaging and labelling checks before shipment, normally when 100% produced and at least 80% packed)
- UTS Sample Evaluation — https://www.utsinspection.com/sample-evaluation.html (accessed 2026-11-04; supports: sample checked against drawings/specifications before use as reference)
- ISO, ISO 9000 family — Quality management — https://www.iso.org/iso-9001-quality-management.html (accessed 2026-11-04; supports: QMS model for consistency, customer focus, process approach and continual improvement; ISO 9001 requirements)
- UTS Quality Management System Audits — https://www.utsinspection.com/quality-management-system-audits.html (accessed 2026-11-04; supports: audit of procedures and controls against practice)
- NIST/SEMATECH e-Handbook of Statistical Methods, Lot Acceptance Sampling — https://www.itl.nist.gov/div898/handbook/pmc/section2/pmc21.htm (accessed 2026-11-04; supports: random sample basis; purpose is lot disposition decision)
- UTS Defect Classification — https://www.utsinspection.com/news_view_24.html (accessed 2026-11-04; supports: critical, major and minor defect levels used for classification)
- NIST Calibrations — https://www.nist.gov/calibrations (accessed 2026-11-04; supports: calibration services help makers and users of precision instruments achieve measurement quality and productivity)
- ISO, ISO/IEC 17025 — Testing and calibration laboratories — https://www.iso.org/ISO-IEC-17025-testing-and-calibration-laboratories.html (accessed 2026-11-04; supports: laboratories demonstrate they operate competently and generate valid results)
- UTS CE, RoHS and REACH Testing Services — https://www.utsinspection.com/rohs-reach-testing-services.html (accessed 2026-11-04; supports: product-specific laboratory coordination; homogeneous-material review and exemption check for RoHS)
- UTS Food Contact Testing Services — https://www.utsinspection.com/food-contact-testing-services.html (accessed 2026-11-04; supports: test plan based on material, intended food, contact time and temperature and market route)
- UTS barcode and QR-code check criterion — 100% scan success for checked codes under agreed equipment and conditions, with matching encoded data; limited to the checked objects and conditions.
- UTS Factory Evaluation & Supplier Verification — https://www.utsinspection.com/factory-evaluation.html (accessed 2026-11-04; supports: supplier/site verification scope)
- ISO 19011:2018, Guidelines for auditing management systems — https://www.iso.org/standard/70017.html (accessed 2026-11-04; withdrawn edition, cited only for general audit principles, audit programmes and conducting audits, not as the current edition)
- UTS Full Inspection — https://www.utsinspection.com/full-inspection.html (accessed 2026-11-04; supports: every unit in the batch individually examined for the agreed points, unlike sampling)
