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Certified reference material

standards used to check the quality and metrological traceability of products

Pronunciation
/ˈsəːtɪfʌɪd ˈrɛfərəns məˈtɪərɪəl/
/ˈsərdɪfaɪd ˈrɛfərəns məˈtɪriəl/
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