Assured Confidence

Legal Metrology

NSAI NML Measurement page with image of a guage

Measurement at NSAI is split across two divisions within NSAI; Legal Metrology and National Metrology Laboratory (NML).

NSAI Legal Metrology uphold and enforce accuracy and transparency in trade measures by certifying and inspecting measuring instruments used by traders and by inspecting pre-packaged goods to ensure correct quantity. NSAI Legal Metrology also operates a calibration service for weights and volume measures.

Terms often associated with Legal Metrology are:

This is the process of determining the metrological characteristics by means of comparision against standards. LMS offers calibration services for mass standards (weights) from 1mg to 1000kg (OIML Class M1 - M3) and for capacity measures up to 2,000 litres.

This is the periodic examination of a measuring instrument used for trade purposes. By law, a trade measuring instrument must be tested at regular intervals over its lifetime by a metrology inspector to ensure continued compliance with legal requirements.
Each measuring instrument is tested and verified to ensure it is working correctly before it can be used for trade. It, thereafter, it is repaired or adjusted, it must be verified again before it can be used.

Type approval
This is the general process undertaken to confirm that the design of a measuring instrument complies with legal requirements.


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