A non-conformance raised against your calibration records does not mean your instruments were wrong. It means you cannot prove they were right.
The distinction matters. In Singapore’s regulated industries including pharmaceutical distribution under HSA GDP, food manufacturing under SFA licensing, HVAC in cleanroom-classified environments, and industrial operations under ISO 9001, calibration is not a maintenance activity. It is a documentation activity. The physical act of calibrating an instrument has no regulatory value without the accredited certificate that proves it was done, by whom, against what reference standard, with what result, and within what acceptable tolerance. That certificate is what an auditor is actually reviewing. That certificate is what your calibration programme must reliably produce.
Altek Solutions provides calibration services to Singapore’s regulated industries using laboratory-grade reference instruments traceable to national measurement standards. We have been issuing calibration certificates structured for SFA, HSA, and ISO audit submission since 1995, across temperature sensors, humidity data loggers, pressure gauges, gas analysers, and the full range of measurement instruments used in cold chain, HVAC, and industrial applications.

At a Glance: What a Compliant Calibration Programme Must Produce
▸ ISO/IEC 17025 accredited calibration certificates, issued by a laboratory with a verified accreditation scope that covers your specific instrument types
▸ Full measurement results showing actual readings at each test point versus reference values, not a pass/fail statement alone
▸ Documented measurement uncertainty, stated for each result and linked to a traceable reference chain
▸ A calibration schedule that ensures no instrument exceeds its defined calibration interval while in active service