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The measurement standards maintained by NML are the most accurate representations of the SI units available in Ireland and provide the gateway by which measurement results can be traced to the International System of Units (SI). In practice, access to the national standards is provided by NML's calibration services which are regularly upgraded and extended to take account of developments in measurement technology and to meet the changing demands of NML's customers. Characterised reference standards, experienced staff and a carefully controlled environment ensure that low measurement uncertainties, suitable for calibrating the highest quality measuring instruments, are achieved.

On the international scene, NML is a signatory of the CIPM Multi-lateral Arrangement (MRA) between national metrology institutes. Further details of the MRA may be found at the Bureau International des Poids et Measures website. This ensures that NML's measurement results and calibration certificates have wide international acceptance. NML is also a member of EUROMET. EUROMET is an Association of National Metrology Institutes of Europe. The objective of EUROMET is to promote the coordination of metrological activities and services with the purpose of achieving higher efficiency.