NMIM plays an important role in disseminating the traceability of measurement to the whole country based on the International System of Units. Just like other world standard laboratories, NMIM has great responsibility in ensuring the national metrology infrastructures meet and comply with the global measurement standards. The importance of the role and functions of NMIM has increased significantly after Malaysia signed the WTO-TBT Agreement, which emphasizes on the importance of harmonized national infrastructure measurement system either domestically or internationally.
NMIM has been mandated to realize, maintain and cause to be maintained the National Measurement Standards and Certified Reference Materials under the National Measurement System Act 2007 (Act 675); while under the Weights and Measures Act 1972 (Act 71), NML-SIRIM has been mandated as the Custodian of the Weights and Measures and at once serves to advise the Minister on matters relating to measurement. With the mandate given, NMIM continuously move forward towards equipping the scope of services to the agency / government department (mainly enforcement agencies such as the Royal Malaysian Police, Road Transport Department, Ministry of Domestic Trade, Cooperatives and Consumerism Ministry Environment etc.), educational institutions / education and industry in order to ensure that individuals, organizations and agencies that receive services can make precise measurements and that has traceability to NMIM.
NMIM also works closely with the Department of Standards Malaysia to ensure traceability to the accredited testing and calibration laboratories and also provides Proficiency Testing and Measurement Audit programs. To ensure the credibility of the National Measurement System Malaysia at the international level, NMIM has participated in many international comparisons such as key comparison, supplementary comparison and proficiency testing program, including active involvement as a member of the Asia Pacific Metrology Programme (APMP) and Asia Pacific Legal Metrology Forum (APLMF). NMIM is also a signatory to the CIPM-MRA on behalf of Malaysia, which allow National Measurement Standards, which are developed in Malaysia as well as certificates of measurement / calibration issued are globally recognized. International memberships of NML-SIRIM includes General Conference of Weights and Measures (CGPM) / Metre Convention, the International Organization of Legal Metrology (OIML), the ASEAN Consultative Committee on Standards and Quality (ACCSQ), the ASEAN Consultative Committee on Standards and Quality on Legal Metrology (ACCSQ-WG3) and the National Conference of Standards Laboratories International (NCSLI).