SAC-SINGLAS accreditation is Singapore's formal recognition that a laboratory meets the internationally accepted standard ISO/IEC 17025 for technical competence and management system requirements. Administered by the Singapore Accreditation Council (SAC) under Enterprise Singapore, SINGLAS (Singapore Laboratory Accreditation Scheme) is the only nationally recognised accreditation body for calibration and testing laboratories in Singapore. When a calibration certificate carries the SAC-SINGLAS mark, it signals that the results are traceable, reliable, and internationally accepted under the ILAC Mutual Recognition Arrangement.

For engineers, quality managers, and procurement officers in Singapore, understanding what SINGLAS accreditation means — and what it does not mean — is essential for making sound decisions about instrument calibration, laboratory selection, and regulatory compliance. This guide covers the framework in full.

What Is SAC-SINGLAS?

SINGLAS stands for the Singapore Laboratory Accreditation Scheme. It was established under the Singapore Accreditation Council (SAC), a national accreditation body that operates under Enterprise Singapore (formerly SPRING Singapore). SAC-SINGLAS evaluates and accredits laboratories against ISO/IEC 17025:2017 — the international standard specifying general requirements for the competence of testing and calibration laboratories.

Accreditation under SINGLAS is voluntary in the sense that laboratories apply for it; however, many industries and government agencies in Singapore require or strongly prefer calibration certificates from SINGLAS-accredited laboratories. Sectors subject to such requirements include pharmaceutical manufacturing (regulated by HSA), food and beverage processing (NEA), marine and offshore (MOM Workplace Safety), construction and building systems (BCA), and utilities (EMA and PUB).

The SAC-SINGLAS mark on a calibration certificate means that the laboratory has been independently assessed by trained SAC assessors, found competent in the specific disciplines and measurement ranges listed in its scope of accreditation, and is subject to ongoing surveillance to maintain that status.

The Role of ISO/IEC 17025 in SINGLAS Accreditation

ISO/IEC 17025:2017 is the global benchmark for laboratory competence. It covers two broad areas: management system requirements (document control, complaints handling, internal audits, corrective actions) and technical requirements (personnel competence, equipment calibration, measurement traceability, test methods, and reporting). A laboratory must satisfy both areas to gain and maintain accreditation.

The 2017 revision of ISO/IEC 17025 introduced a stronger emphasis on risk-based thinking, alignment with ISO 9001:2015 management principles, and a more explicit treatment of measurement uncertainty. Laboratories accredited under the older 1999 version were required to transition to the 2017 standard; all current SINGLAS-accredited laboratories operate under ISO/IEC 17025:2017.

Key technical requirements that accreditation assessors evaluate include:

  • Measurement traceability — all reference standards must be traceable to national or international measurement standards through an unbroken chain of calibrations
  • Measurement uncertainty — laboratories must estimate and report uncertainty for every calibration result
  • Equipment management — reference equipment must be calibrated at defined intervals and records maintained
  • Personnel competence — staff performing calibrations must have documented training, qualifications, and competency records
  • Environmental conditions — temperature, humidity, vibration, and cleanliness must be controlled and monitored for each discipline
  • Calibration methods — methods must be validated, documented, and either based on published standards or internally validated with traceability

ILAC-MRA: International Recognition of SINGLAS Certificates

One of the most commercially significant aspects of SINGLAS accreditation is Singapore's membership in the International Laboratory Accreditation Cooperation (ILAC) Mutual Recognition Arrangement (MRA). ILAC-MRA is a network of accreditation bodies from over 100 economies that have peer-reviewed each other and agreed to accept each other's accreditation decisions.

The practical consequence for Singaporean businesses is that a calibration certificate from a SINGLAS-accredited laboratory is accepted in all ILAC-MRA signatory economies — including the United States (A2LA, NVLAP), the European Union (DAKKS, UKAS, COFRAC and others), Australia (NATA), Japan (IAJapan), and China (CNAS) — without the need for re-calibration when equipment is shipped for use or inspection abroad.

This international recognition is particularly valuable for:

  • Export-oriented manufacturers whose products are tested or certified in multiple markets
  • Marine and offshore companies operating vessels or equipment across jurisdictions
  • Pharmaceutical companies seeking GMP compliance across multiple regulatory authorities
  • Construction firms working on cross-border infrastructure projects

Unitest Instruments holds SAC-SINGLAS accreditation number LA-2023-0845-C, making its calibration certificates internationally recognised under the ILAC-MRA framework. Learn more about our calibration services and the disciplines covered.

Calibration Disciplines Covered Under SINGLAS

SINGLAS accreditation is granted by discipline and by measurement range. A laboratory's scope of accreditation — a document published on the SAC website and included with accredited certificates — specifies exactly which measurements the laboratory is accredited to perform. Users should always verify that the measurement they require falls within the laboratory's stated scope before submitting instruments for calibration.

The main calibration disciplines recognised under SINGLAS include:

Discipline Typical Instruments Covered Relevant Industry
Electrical Multimeters, clamp meters, insulation testers, power analysers Electrical, electronics, utilities
Temperature Thermometers, RTDs, thermocouples, data loggers, ovens Pharma, food, HVAC, industrial
Pressure Pressure gauges, transducers, manometers, vacuum gauges Oil and gas, manufacturing, marine
Humidity and Moisture Hygrometers, dew-point sensors, RH probes, data loggers Pharma, semiconductor, storage
Dimensional Callipers, micrometers, gauges, torque wrenches Engineering, aerospace, precision manufacturing
Force and Torque Force gauges, load cells, torque meters Automotive, aerospace, structural
Flow Flow meters, rotameters, gas flow standards Chemical, utilities, water treatment
Chemical pH meters, conductivity meters, dissolved oxygen sensors Water treatment, food, environment

Unitest Instruments is accredited across all eight of these disciplines, providing a single-source calibration solution for organisations managing diverse instrument fleets. See our full explanation of ISO/IEC 17025 calibration for more detail on what each discipline involves.

How the Accreditation Process Works

Laboratories seeking SINGLAS accreditation follow a structured process administered by SAC. The key stages are:

  1. Application: The laboratory submits an application to SAC, specifying the disciplines and measurement ranges it wishes to be accredited for, along with its quality manual and documented procedures.
  2. Document review: SAC reviews the laboratory's management system documentation for conformity with ISO/IEC 17025:2017 requirements before proceeding to an on-site assessment.
  3. On-site assessment: A team of SAC technical assessors — typically comprising a lead assessor and one or more technical experts for each discipline — visits the laboratory. They review equipment records, witness calibrations, interview staff, and examine environmental controls and calibration records.
  4. Proficiency testing: Laboratories must demonstrate participation in appropriate proficiency testing or interlaboratory comparisons to confirm their measurement capability is consistent with other accredited laboratories.
  5. Granting of accreditation: If the laboratory satisfies all requirements, SAC grants accreditation and issues an accreditation number and scope of accreditation document. The scope is published on the SAC website.
  6. Surveillance: Accreditation is maintained through annual surveillance visits and a full reassessment every four years. Non-conformities identified during surveillance must be addressed through documented corrective actions.

Why SAC-SINGLAS Accreditation Matters for Your Business

Choosing a SINGLAS-accredited calibration laboratory is not merely a box-ticking exercise — it has direct commercial and technical consequences.

Regulatory compliance: Multiple Singapore regulatory bodies explicitly reference or require traceable calibration as part of compliance. HSA's Good Manufacturing Practice (GMP) guidelines for pharmaceutical manufacturers require that measuring equipment used in production and quality control be calibrated against standards traceable to national or international standards. MOM's Workplace Safety and Health regulations require that safety-critical measurement equipment — including gas detectors and pressure gauges — be maintained in calibrated condition.

Audit readiness: ISO 9001 (quality management), ISO 14001 (environmental management), ISO 45001 (occupational health and safety), and industry-specific standards such as IATF 16949 (automotive) all require organisations to ensure that monitoring and measuring equipment is calibrated or verified against traceable standards at specified intervals and that calibration records are maintained. A certificate from a SINGLAS-accredited laboratory provides immediate audit evidence.

Measurement confidence: Calibration from an accredited laboratory includes a statement of measurement uncertainty. This allows engineers and quality managers to assess whether their instruments are fit for the intended measurement purpose — whether the uncertainty of the instrument, as calibrated, is small enough relative to the tolerance of the measurement being made.

Legal defensibility: In product liability, insurance, and contractual disputes, calibration records from an accredited laboratory carry significantly more weight than those from a non-accredited source. The independent third-party assessment underlying accreditation makes the records more credible to courts and arbitrators.

Choosing the Right SINGLAS-Accredited Laboratory

Not all SINGLAS-accredited laboratories are equal. Accreditation is discipline-specific and range-specific, so the first step is to verify that the laboratory's published scope of accreditation covers the instrument type and measurement range you need to calibrate.

Beyond scope, consider:

  • Turnaround time: Standard in-lab calibration turnaround at Unitest Instruments is 3–5 working days, with expedited options available on request. Understand the laboratory's standard lead time and whether rush services are available.
  • On-site capability: For large or installed equipment that cannot be moved — such as tank level gauges, process pressure transmitters, or environmental monitoring systems — on-site calibration is required. Confirm that the laboratory can mobilise calibration equipment to your facility. Unitest Instruments offers on-site calibration services across Singapore.
  • Certificate quality: A well-prepared calibration certificate should include the instrument description, serial number, reference standard identification and traceability, environmental conditions during calibration, measurement results, measurement uncertainty, and the calibration date and due date. Laboratories that omit uncertainty or do not specify traceability should be treated with caution.
  • Responsiveness: Unitest Instruments responds to calibration enquiries within 2 business hours. Fast, clear communication is important when you are working to equipment downtime windows or audit deadlines.

To check whether a laboratory is currently accredited, visit the SAC website and search the accredited laboratory directory. Verify the accreditation number matches the certificate you have received or intend to receive.

Common Misconceptions About SINGLAS Accreditation

Several misconceptions circulate about laboratory accreditation in Singapore that are worth addressing directly.

"ISO 9001 certification means the same thing as ISO/IEC 17025 accreditation." This is incorrect. ISO 9001 is a quality management system standard; it governs how an organisation manages its processes but does not require technical competence in measurement. ISO/IEC 17025 goes further by requiring laboratories to demonstrate actual technical capability through proficiency testing, traceable reference standards, and measurement uncertainty estimation. A laboratory can be ISO 9001 certified without being technically competent to perform calibrations.

"A calibration sticker is enough." A calibration sticker without an accompanying certificate showing measurement results, uncertainty, and traceability to an accredited standard provides no technical assurance. Auditors and regulators typically require the full certificate.

"Any laboratory can issue a SINGLAS certificate." Only laboratories that hold current SAC-SINGLAS accreditation may issue certificates bearing the SAC-SINGLAS mark. Using the mark without accreditation is a violation of SAC's terms and potentially a misrepresentation under Singapore's fair trading laws.

For further reading on calibration fundamentals, see our article on how often to calibrate instruments and our guide to ISO 17025 calibration explained.

Unitest Instruments and SAC-SINGLAS Accreditation

Unitest Instruments Pte Ltd holds SAC-SINGLAS accreditation number LA-2023-0845-C, covering all eight calibration disciplines: electrical, temperature, pressure, humidity and moisture, dimensional, force and torque, flow, and chemical. With over 20 years of operation as Singapore's authorised distributor for leading brands including Fluke, Rotronic, and Comark, Unitest Instruments combines equipment expertise with calibration competence — meaning that the engineers performing your calibrations understand the instruments they are working with at a deep technical level.

Our laboratory is located at 18 Boon Lay Way, #04-93, Tradehub 21, Singapore 609966. Standard calibration turnaround is 3–5 working days. We also offer on-site calibration for installed systems and equipment that cannot be transported. To discuss your calibration requirements, contact us at sales@unitestinst.com or call +65 6659 8878. Enquiries are responded to within 2 business hours.

Ready to engage an accredited calibration laboratory? Contact Unitest Instruments to discuss your requirements.