certified reference material

standards used to check the quality and metrological traceability of products

en-US/ˈsɝdəˌfaɪd ˈɹɛfɹəns məˈtɪɹiəl/
en-GB/ˈsɜːtɪfaɪd ˈɹɛfɹəns məˈtɪəɹɪəl/

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