Key takeaways
- SAC-SINGLAS is Singapore's national accreditation scheme for labs, assessing them to ISO/IEC 17025.
- Accreditation ≠ certification. Accreditation independently verifies technical competence; certification confirms a system conforms.
- Accreditation is granted for a defined scope — specific measurements, ranges and uncertainties, not a blanket badge.
- The accreditation number (e.g. LA-2023-0845-C) lets anyone confirm a lab's status and scope.
- In an audit, an accredited certificate is third-party proof — it lets the auditor accept the measurement without re-checking the lab.
Where the word "accredited" actually comes from
It is one of the most over-used words in supplier marketing, so it is worth being precise. In the metrology world, accreditation has a specific meaning: a recognised, independent accreditation body has assessed a laboratory and formally attested to its competence to carry out defined tasks.
In Singapore, that body is SAC-SINGLAS — the laboratory accreditation scheme operated under the Singapore Accreditation Council. When a calibration lab is "SAC-SINGLAS accredited," an assessor has been on site, examined the lab against ISO/IEC 17025, and signed off that it can do what it claims. The lab is then issued a unique accreditation number and a published scope.
Accreditation vs certification — the distinction that matters
People blur these constantly, and the blur is where weak suppliers hide. They are not the same thing, and the gap between them is exactly what an auditor cares about.
| Certification | Accreditation | |
|---|---|---|
| Question it answers | Does an organisation conform to a standard? | Is this lab technically competent to produce this measurement? |
| Typical example | A company certified to ISO 9001 | A lab accredited to ISO/IEC 17025 |
| What is assessed | The management system and its processes | Actual methods, equipment, traceability and uncertainty |
| Granted by | A certification body | A national accreditation body (SAC-SINGLAS in SG) |
| Scope | Broad — the system as a whole | Specific — named measurements, ranges, uncertainties |
Put simply: a certified company has a system. An accredited lab has been independently proven able to get the number right. For calibration, you want the second one.
What accreditation actually verifies
When SAC-SINGLAS accredits a calibration lab to ISO/IEC 17025, the assessment reaches into the things that determine whether a result can be trusted:
- Technical competence of staff — that the people running the measurements know the method and its pitfalls.
- Validated methods — the calibration procedures are appropriate and properly applied.
- Traceability — an unbroken chain linking the lab's reference standards back to national standards.
- Measurement uncertainty — that the lab has a defensible uncertainty budget for each measurement it offers.
- Equipment and environment — that the reference standards and lab conditions support the claimed performance.
That is why an accredited certificate carries weight an unaccredited one cannot: every one of those points has already been checked by someone with no stake in the result.
Read the scope, not just the logo
A crucial detail that even experienced buyers miss: accreditation is granted for a specific scope. A lab is not "accredited for everything" — it is accredited for defined measurements, parameters, ranges and best measurement uncertainties. The right question is never "are you accredited?" but "is the measurement I need inside your accredited scope?"
Why your auditor relaxes when they see it
Your ISO 9001 auditor has a job to do under clause 7.1.5: confirm your measuring equipment is calibrated against traceable standards. Without accreditation, they would, in principle, have to satisfy themselves that the lab you used is competent and traceable. An accredited certificate does that work for them — a national body has already verified it. The finding closes itself.
Want the logo to actually mean something on your certificate?
We're a SAC-SINGLAS accredited lab — ask us for our scope and we'll confirm your instrument is covered before you send it, so the accreditation genuinely backs your result.
Where Unitest stands
Unitest Instruments is accredited by SAC-SINGLAS to ISO/IEC 17025 under accreditation number LA-2023-0845-C, with measurements traceable to Singapore's National Metrology Centre. The accreditation covers eight calibration disciplines — electrical, temperature, infrared/non-contact, humidity, pressure, oscilloscopes, scales and balances, and tachometers — and our certificates state the measurement uncertainty so they hold up when an auditor reads them line by line.
Frequently asked questions
What is SAC-SINGLAS?
It is Singapore's national accreditation scheme for laboratories, operated under the Singapore Accreditation Council. It assesses calibration and testing labs against ISO/IEC 17025 and grants accreditation, with a unique number, to those that meet the standard.
Is accreditation the same as certification?
No. Certification confirms a system conforms to a standard. Accreditation is a higher bar for labs: an independent national body assesses the lab's actual technical competence to perform specific measurements to ISO/IEC 17025 — including methods, traceability and uncertainty.
What does the accreditation number tell me?
It is the lab's unique identifier, letting you confirm its accreditation status and the specific scope of measurements it is accredited for. Unitest holds SAC-SINGLAS accreditation number LA-2023-0845-C to ISO/IEC 17025.
Why does it matter for my ISO 9001 audit?
Because it lets your auditor accept a calibration result without re-verifying the lab. The accreditation body has already assessed competence, traceability and uncertainty, so an accredited certificate is independent proof the measurement behind your conformity decision is sound.
Unitest Instruments — a SAC-SINGLAS accredited calibration laboratory (ISO/IEC 17025, No. LA-2023-0845-C), with measurements traceable to Singapore's National Metrology Centre. We hold the accreditation we are writing about.
Want a certificate that holds up?
Calibration from a SAC-SINGLAS accredited lab — in scope, in date, with stated uncertainty.