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In order to fulfil its mission to ensure and promote the global comparability of measurements, the BIPM operates laboratories in the fields of physical metrology, time, ionizing radiation and chemistry. These laboratories act as centres for scientific and technical collaboration between Member States providing capabilities for international measurement comparisons on a sharedcost basis. They coordinate international comparisons of national measurement standards agreed to be of the highestdoi:10.1088/1681-7575/aaa48d fatcat:wcd37xyfoffi5aks635lsf2nku