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The Asia Pacific Metrology Programme (APMP) is primarily responsible for developing international recognition of the measurement capabilities of the region's national and territorial measurement laboratories. APMP has been operating in the Asia-Pacific since its inception as a Commonwealth Science Council initiative in 1977. As such, it is the oldest continually operating metrological group in the world.

This website deals with issues in the Technical Committee for Length (TCL). This group is concerned with the discussion of technical issues which are important to industry and researchers and which are related to the unit of length, the metre. The  website is primarily intended for use by APMP length contact persons as a repository for documents and dissemination of information, but it is expected to be of use to other length metrology experts worldwide.