Short answer: an independent inspection certificate states what a named inspector examined, sampled or measured, at a stated place and time, by a stated method, and what was found. It certifies nothing outside that scope. A certificate that reports moisture and foreign matter says nothing about aflatoxin; a certificate issued at loading says nothing about condition on arrival; and a pass on a sample is not a pass on every bag. Buyers often pay for a narrow scope believing they bought a broad one. Write the risks you need covered into the inspection order, the contract and any letter of credit, and read every certificate against that scope.
What an inspection company undertakes, and to whom
An inspection company works for whoever instructs it: the buyer, the seller, or both under a contract that names the inspector. It undertakes to carry out the instructed scope and report what it found, not to guarantee the goods. Before relying on a report, read the inspector's terms of business, including any limitation of liability.
Two other kinds of inspection are often confused with commercial inspection:
- Government-mandated pre-shipment inspection (PSI). The WTO describes PSI as the use of private companies to check shipment details such as price, quantity and quality of goods ordered overseas, and its Agreement on Preshipment Inspection sets rules for governments that use it (WTO, preshipment inspection).
- Destination conformity programmes. Kenya's Pre-Export Verification of Conformity (PVoC), run by the Kenya Bureau of Standards, assesses products in exporting countries against Kenyan standards, approved specifications and other applicable regulations. KEBS says contracted inspection companies implement the programme and defines both Certificates of Conformity and Certificates of Inspection. For the current geographical allocation, use the PVoC Manual Version 15, dated 19 February 2026: it groups exporting countries into eight numbered zones and lists nine contracted inspection companies. The overview on the KEBS PVoC webpage still says "nineteen regions"; because that summary conflicts with the newer operational manual and the zone table on the same page, this guide does not treat 19 as the current allocation count. Nigeria's SONCAP Offshore scheme lists food products among its exemptions, although SON notes that exemption from the scheme does not mean a product is unregulated (SON, SONCAP FAQ).
These regimes answer the importing country's questions and do not replace the buyer's own scope, or the reverse. Programmes, agents and product lists change, so recheck the authority's page and ask a customs broker before each shipment; other countries run different programmes or none.
Common scopes, and what each leaves out
| Scope | What the inspector does | What it does not tell you |
|---|---|---|
| Quantity | Tallies units; check-weighs sample units; for bulk, weighs or runs a draught survey | Quality, or quantity lost after the survey |
| Quality (visual) | Checks samples against the specification for visible defects, grading and foreign matter | Anything needing laboratory analysis |
| Quality (analytical) | Draws and seals samples for a laboratory to analyse named parameters | Parameters not named in the order |
| Packing | Checks pack type, fill, condition and closures | Whether packing will survive the voyage |
| Marking and labelling | Compares marks, lot codes and labels with the approved artwork | Whether the label meets destination law |
| Loading supervision | Checks container condition, counts what is loaded, records stowage | Condition of goods not seen being loaded |
| Sealing | Records container seal numbers; seals samples | What happens after the seal is applied |
For a first order of packaged food, a common combination is a final random inspection shortly before loading, followed by loading supervision, so the goods inspected are the goods loaded. For the specification those checks are measured against, see writing a specification suppliers can quote against.
Sampling plans: why a sample is a sample
Every quality result on a lot rests on a sample, and any sampling plan carries a risk of accepting a lot that contains defects.
Packaged goods. Attribute sampling is commonly based on ISO 2859-1, Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection. Its third edition was published in January 2026 and replaced the 1999 edition and its amendments (ISO, ISO 2859-1:2026). ISO's catalogue description states that the AQL is used to determine sample sizes and acceptance thresholds, that the standard is intended for a continuing series of lots, and that the 2026 edition adds skip-lot procedures. The standard's tables are not reproduced here; your inspection provider applies them. A single first shipment is not a continuing series. ISO 2859-2 provides plans for "an isolated lot, a unique lot or a short series of lots", where switching rules such as those of ISO 2859-1 do not apply (ISO, ISO 2859-2:2020). Ask the provider which plan and AQL it proposes, and write them, with the standard and edition, into the order.
Bulk commodities. Increments drawn during loading are combined into samples representing a stated quantity. Gafta Sampling Rules No. 124, for contracts dated from 1 October 2025, require sampling by a superintendent on Gafta's approved register, at loading or discharge, with one set of contractual samples per 5,000 tonnes or part thereof (Gafta, Sampling Rules No. 124). FOSFA member superintendents sample oils, fats and oilseeds by FOSFA's contractual methods, mainly ISO methods with some AOCS methods (FOSFA, contractual methods of sampling). Where no trade-association rules apply, the Codex General Guidelines on Sampling (CXG 50-2004, revised 2023) are a useful reference (Codex Alimentarius, CXG 50-2004).
Some contaminants make sampling harder still. Codex explains that aflatoxin may not be uniformly dispersed, which is why its plans build an aggregate sample from many small portions (Codex Alimentarius, CXS 193-1995). Contaminant sampling design and the custody of sealed counter-samples are separate specialist subjects; a certificate is only as representative as the plan behind it.
For food, also decide what a sampling plan should not decide. A blown can, a foreign body or a wrong allergen label is a safety finding: state that any such finding stops the lot for investigation, whatever the acceptance number.
Load-port versus discharge-port results
A load-port certificate and a discharge-port report can both be honest and still disagree. Common reasons:
- Time and transit. Moisture migrates, product loses weight, and damage can occur after sealing.
- Different samples. Two sampling exercises on a heterogeneous lot will not draw the same material.
- Different methods or laboratories. A moisture result by one method need not match another method's result.
- Measurement uncertainty. Codex's sampling guidelines say measurement uncertainty and inspection error should be taken into account when judging results.
- Quantity methods. West of England P&I Club notes that draught-survey accuracy "may vary typically by between 0.5 and 1.0%", with errors from water density, draught readings, ballast soundings and squat (West P&I, inaccuracies in draught surveys).
The contract should therefore say which result governs price and acceptance: the loading certificate, the discharge result, or a stated route for resolving a difference. Loss or damage during the voyage is a matter for cargo insurance and carrier claims, covered in marine cargo insurance for food shipments.
Analysis methods: naming the method, the laboratory and the tolerance
A result without a method is hard to compare with anything. For each analytical parameter, the order and the contract should name:
- The method. For some commodities a specialist body publishes the methods; ICUMSA, for example, is the international body concerned solely with analytical methods for the sugar industry (ICUMSA).
- The laboratory. Ask for a laboratory accredited to ISO/IEC 17025, which sets requirements for the competence, impartiality and consistent operation of testing laboratories (ISO, ISO/IEC 17025:2017), and check that the parameter is within its accredited scope. The UK body UKAS, for example, explains that accredited activities are listed on the schedule of accreditation (UKAS, FAQs). Accreditation bodies that sign the ILAC arrangement recognise one another's accredited laboratories and inspection bodies (ILAC, MRA and signatories).
- The inspection body. Accreditation to ISO/IEC 17020, the standard for bodies performing inspection, whose third edition was published in March 2026 (ISO, ISO/IEC 17020:2026), or membership of the relevant approved register. Gafta requires its approved superintendents to hold its own standard certificate or ISO/IEC 17020 Type A accreditation (Gafta, approved superintendents).
- The limit and the tolerance. State the specification limit and how a result close to it is treated.
Making the certificate a payment condition
An inspection certificate is a document in its own right; see the document set behind one shipment. If payment depends on it, the scope becomes the payment condition. Under a credit, the bank examines the document, not the goods, so the credit should call for a certificate issued by a named or defined independent inspector, stating the scope and results the contract requires, and nothing the seller cannot obtain. How to read those document clauses before accepting a credit is covered in reading an LC before you accept it; why a mismatched certificate leads to refusal is in why banks refuse documents. Where an inspection result releases a stage payment outside a credit, see advance payment: how much is reasonable. Agree the certificate wording with your bank before the credit is issued.
Worked example: a sesame scope gap
Hypothetical teaching example. Names, figures and prices are invented for illustration; no real limit or result is represented.
A buyer orders 200 tonnes of hulled sesame at 300,000 CU, paid by letter of credit against an inspection certificate. The buyer commissions load-port inspection scoped to moisture and foreign matter, at a fee of 1,800 CU. The certificate reports both within the contract limits, the bank pays, and the goods sail.
At destination, the importing authority samples the lot and reports aflatoxin above the destination's limit. The buyer asks why the inspector missed it.
| Question | Answer in this example |
|---|---|
| Did the inspector certify aflatoxin? | No. It was never in the scope |
| Is the certificate wrong? | No. It reports what was instructed |
| Could a load-port aflatoxin test have failed to catch it? | Possibly, because contamination is uneven and depends on the sampling plan |
| What would have narrowed the gap? | Aflatoxin in the scope, with a named sampling plan, method and accredited laboratory, and the result required in the credit |
The loss came from a scope gap, not a dishonest inspector.
The boundary: what an inspection certificate is not
- Not a guarantee of safety. It reports named parameters on a sample.
- Not proof of compliance. Destination approval, labelling rules and health certification are separate requirements.
- Not proof of acceptance. The buyer's rights under the contract and the importing authority's decision stand apart from it.
- Not evidence about unsampled units, unlisted parameters or arrival condition.
Writing the scope: checklist
- Who appoints and pays the inspector, and whether the other party may attend.
- The inspection body, or the qualifying accreditation or register.
- The scope: each quantity, quality, packing, marking, loading and sealing item, with the specification and artwork attached.
- Timing and place, including loading supervision.
- The sampling standard and edition, or the named trade-association rules.
- The method, laboratory and tolerance for each analytical parameter.
- What fails the lot, and whether re-sorting and re-inspection are allowed, at whose cost.
- Which result governs, loading or discharge.
- The report's content, deadline and, under a credit, its exact wording.
Common mistakes
- Ordering "an inspection" without a written scope, so the report covers what the inspector chooses.
- Citing "AQL 2.5" without the standard, edition, plan or defect classes.
- Inspecting at the factory without supervising loading.
- Leaving contaminants the destination tests for out of the scope.
- Requiring a certificate in a credit that states nothing the contract needs.
Limits and what to recheck
ISO 2859-1 and ISO/IEC 17020 both have 2026 editions; confirm which edition your contract, credit and provider use. Gafta and FOSFA rules are revised periodically, and programmes such as PVoC change; recheck them before each shipment. This is general information. For sampling plans consult your inspection provider, for analysis an accredited laboratory, for credit wording your bank, and for contract terms your lawyer.
FAQ
What is an inspection certificate? A report by an inspector stating what was examined, sampled or measured, where, when and by what method, and what was found.
Who issues an inspection certificate? An independent inspection company or superintendent appointed under the contract, or, under a government programme, an agent acting for the importing authority.
Does a clean inspection certificate mean the cargo will be accepted at destination? No. It covers only its scope and sample. Destination requirements and arrival condition are separate.
Is an inspection certificate the same as a certificate of analysis? No. An inspection certificate covers the inspector's scope; a certificate of analysis reports a laboratory's results on a sample for named parameters.
Next step
Before appointing an inspector, turn the purchase specification into a one-page inspection order. Name the lot, place and timing; quantity checks; sampling standard and sample size; test methods and laboratory; tolerances; packing, marking and seal checks; required photographs; pass/fail rule; certificate wording; distribution list; and what happens after a non-conformity. Send the draft to the inspector, supplier, buyer and—if payment is under a letter of credit—the bank for written confirmation before loading.
Resources
- WTO — Technical information on pre-shipment inspection — https://www.wto.org/english/tratop_e/preship_e/preship_e.htm (accessed 23 September 2026)
- Kenya Bureau of Standards — Pre-Export Verification of Conformity — https://www.kebs.org/pre-export-verification-of-conformity/ (accessed 1 October 2026)
- Kenya Bureau of Standards — PVoC Manual Version 15, dated 19 February 2026 — https://www.kebs.org/wp-content/uploads/2026/02/PVOC-MANUAL-VERSION-15.pdf (accessed 1 October 2026)
- Standards Organisation of Nigeria — SONCAP FAQ — https://son.gov.ng/soncap-faq/ (accessed 1 October 2026)
- ISO — ISO 2859-1:2026 Sampling procedures for inspection by attributes, Part 1 — https://www.iso.org/standard/85464.html (accessed 1 October 2026)
- ISO — ISO 2859-2:2020 Sampling plans indexed by limiting quality for isolated lot inspection — https://www.iso.org/standard/64505.html (accessed 1 October 2026; still the published edition)
- Gafta — Sampling Rules No. 124 — https://www.gafta.com/media/l0cejvxm/124_2025.pdf (accessed 1 October 2026)
- Gafta — Approved Register of Superintendents — https://www.gafta.com/approved-registers/superintendents/?category=SUPR (accessed 23 September 2026)
- FOSFA International — Contractual methods of sampling — https://www.fosfa.org/technical/member-superintendents-scheme/contractual-methods-of-sampling/ (accessed 23 September 2026)
- Codex Alimentarius (FAO/WHO) — General Guidelines on Sampling, CXG 50-2004 — https://www.fao.org/fao-who-codexalimentarius/sh-proxy/es/?lnk=1&url=https%3A%2F%2Fworkspace.fao.org%2Fsites%2Fcodex%2FStandards%2FCXG+50-2004%2FCXG_050e.pdf (accessed 23 September 2026)
- Codex Alimentarius (FAO/WHO) — General Standard for Contaminants and Toxins in Food and Feed, CXS 193-1995 — https://www.fao.org/fao-who-codexalimentarius/sh-proxy/fr/?lnk=1&url=https%3A%2F%2Fworkspace.fao.org%2Fsites%2Fcodex%2FStandards%2FCXS+193-1995%2FCXS_193e.pdf (accessed 23 September 2026)
- West of England P&I Club — Inaccuracies in draught surveys — https://www.westpandi.com/news-and-resources/loss-prevention-bulletins/inaccuracies-in-draught-surveys/ (accessed 23 September 2026)
- ICUMSA — Home page — https://www.icumsa.org/ (accessed 23 September 2026)
- ISO — ISO/IEC 17025:2017 General requirements for the competence of testing and calibration laboratories — https://www.iso.org/standard/66912.html (accessed 23 September 2026)
- ISO — ISO/IEC 17020:2026 Requirements for bodies performing inspection — https://www.iso.org/standard/17020 (accessed 1 October 2026)
- UKAS — Frequently asked questions — https://www.ukas.com/faqs/ (accessed 23 September 2026)
- ILAC — ILAC MRA and signatories — https://ilac.org/ilac-mra-and-signatories/ (accessed 23 September 2026)
