ISO/IEC 17025 Calibration Explained for UAE Laboratory Managers

What does "traceable" mean in a calibration context?

Traceability in metrology means that a measurement result can be related — through an unbroken chain of calibrations — to a national or international measurement standard. For mass (weighing), this chain runs: your balance → the calibration laboratory's reference weights → the national metrology authority (in the UAE: ESMA/UAE-NMI) → the International Bureau of Weights and Measures (BIPM) and its realisation of the International System of Units (SI).

A calibration certificate is only truly "traceable" if it documents this chain explicitly: the certificate must state the reference standards used, their calibration source, and the measurement uncertainty contributed at each level. AND Gulf's calibration certificates reference DAC or ENAS-registered reference weights, providing the documented traceability chain required by ISO 9001:2015, GMP Annex 15, and laboratory accreditation bodies.

What must a calibration certificate contain?

An ISO/IEC 17025-compliant calibration certificate for a weighing instrument must document: the identity of the instrument (model, serial number, manufacturer); the reference standards used and their traceability; the calibration method applied; the test points (load values at which the balance was tested); the results at each test point (reading, error, repeatability); the expanded measurement uncertainty (typically at k=2, 95% confidence level); the environmental conditions during calibration; and the date of calibration and next recommended calibration date.

Certificates that state only "pass/fail" without numerical data — a common failing of low-cost calibration services — do not meet ISO/IEC 17025 requirements and should not be accepted for GMP, ISO 9001, or laboratory accreditation audits.

How often must balances be calibrated in the UAE?

UAE regulations do not specify a mandatory calibration interval for all industries, but sector-specific requirements apply. In pharmaceutical GMP facilities regulated by the UAE Ministry of Health, ICH Q7 and GMP Annex 15 require calibration "at defined intervals" — typically annually for analytical balances and semi-annually for high-use production floor balances. ISO 9001:2015 Clause 7.1.5 requires calibration "at specified intervals or before use" against national or international measurement standards.

For ISO/IEC 17025-accredited laboratories, the laboratory's accreditation body (DAC or ENAS) will specify calibration intervals as part of the accreditation conditions — typically annually. Legal-for-trade balances under UAE Federal Law No. 28 require verification (a specific legal calibration) every 1–2 years by the UAE Metrology Department.

AND Gulf's calibration service

AND Gulf issues calibration certificates for all A&D Japan instruments from our JAFZA laboratory, with reference weight traceability to DAC and ENAS. Our certificates document all required parameters for ISO/IEC 17025, GMP Annex 15, and ISO 9001 audits. Mobile calibration units serve UAE, KSA, Kuwait, Qatar, Bahrain, Oman, and Pakistan. Same-day calibration is available for production-critical instruments.