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.
What Is SAC-SINGLAS?
SINGLAS stands for the Singapore Laboratory Accreditation Scheme, established under the Singapore Accreditation Council (SAC), which operates under Enterprise 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 is voluntary in that laboratories apply for it, but many industries and government agencies require or strongly prefer certificates from SINGLAS-accredited laboratories — including pharmaceutical manufacturing (HSA), food and beverage (NEA), marine and offshore (MOM Workplace Safety), construction (BCA), and utilities (EMA and PUB). The mark on a certificate means the laboratory has been independently assessed by trained SAC assessors, found competent in the specific disciplines and 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 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). All current SINGLAS-accredited laboratories operate under the 2017 revision, which introduced a stronger emphasis on risk-based thinking and a more explicit treatment of measurement uncertainty. Key technical requirements assessors evaluate include:
- Measurement traceability — reference standards traceable to national or international standards through an unbroken chain of calibrations
- Measurement uncertainty — estimated and reported for every calibration result
- Equipment management — reference equipment calibrated at defined intervals with records maintained
- Personnel competence — documented training, qualifications and competency records
- Environmental conditions — temperature, humidity, vibration and cleanliness controlled and monitored per discipline
- Calibration methods — validated, documented, and based on published standards or internally validated with traceability
ILAC-MRA: International Recognition of SINGLAS Certificates
Singapore's membership in the International Laboratory Accreditation Cooperation (ILAC) Mutual Recognition Arrangement means 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), Australia (NATA), Japan (IAJapan), and China (CNAS) — without needing re-calibration when equipment is shipped or inspected abroad. This is particularly valuable for export-oriented manufacturers, marine and offshore companies operating across jurisdictions, pharmaceutical companies seeking multi-authority GMP compliance, and construction firms on cross-border 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: application, specifying disciplines and ranges sought with the quality manual and procedures; document review for ISO/IEC 17025:2017 conformity; on-site assessment where SAC technical assessors review equipment records, witness calibrations, and interview staff; proficiency testing via interlaboratory comparisons to confirm measurement capability; granting of accreditation, with a number and published scope; and surveillance — annual visits plus a full reassessment every four years.
Why SAC-SINGLAS Accreditation Matters for Your Business
Choosing a SINGLAS-accredited laboratory has direct commercial and technical consequences. Regulatory compliance: HSA's GMP guidelines require pharmaceutical measuring equipment to be calibrated against traceable standards; MOM's Workplace Safety and Health regulations require safety-critical equipment (gas detectors, pressure gauges) to be maintained in calibrated condition. Audit readiness: ISO 9001, ISO 14001, ISO 45001 and IATF 16949 all require monitoring and measuring equipment to be calibrated or verified against traceable standards at specified intervals, and a SINGLAS-accredited certificate provides immediate audit evidence. Measurement confidence: accredited calibration includes a stated measurement uncertainty, letting engineers assess whether an instrument's uncertainty is small enough relative to the tolerance being measured. Legal defensibility: in liability, insurance and contractual disputes, accredited records carry significantly more weight.
Choosing the Right SINGLAS-Accredited Laboratory
Accreditation is discipline- and range-specific, so first verify the laboratory's published scope covers your instrument type and range. Beyond scope, consider: turnaround time (standard in-lab turnaround at Unitest Instruments is 3–5 working days, with expedited options available); on-site capability for large or installed equipment that cannot be moved (tank level gauges, process pressure transmitters); certificate quality — a well-prepared certificate includes instrument description, serial number, reference standard traceability, environmental conditions, measurement results, uncertainty, and calibration/due dates, and labs omitting uncertainty or traceability should be treated with caution; and responsiveness (Unitest Instruments responds within 2 business hours). To verify a laboratory's status, search the SAC website's accredited laboratory directory and confirm the accreditation number matches your certificate.
Common Misconceptions About SINGLAS Accreditation
"ISO 9001 certification means the same thing as ISO/IEC 17025 accreditation." Incorrect — ISO 9001 governs how an organisation manages its processes but doesn't require technical competence in measurement, while ISO/IEC 17025 requires laboratories to demonstrate actual technical capability through proficiency testing, traceable standards, and uncertainty estimation. "A calibration sticker is enough." A sticker without an accompanying certificate showing results, uncertainty and traceability provides no technical assurance. "Any laboratory can issue a SINGLAS certificate." Only laboratories holding current accreditation may use the SAC-SINGLAS mark; using it without accreditation is a violation of SAC's terms and potentially a misrepresentation under Singapore's fair trading laws.
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 as Singapore's authorised distributor for Fluke, Rotronic and Comark, Unitest Instruments combines equipment expertise with calibration competence. Our laboratory is located at 18 Boon Lay Way, #04-93, Tradehub 21, Singapore 609966. Standard turnaround is 3–5 working days, with on-site calibration also offered for installed systems. Contact us at sales@unitestinst.com or +65 6659 8878; enquiries are answered within 2 business hours.
Ready to engage an accredited calibration laboratory? Contact Unitest Instruments to discuss your requirements.