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https://www.nist.gov/srm
NIST supports accurate and compatible measurements by certifying and providing over 1200 Standard Reference Materials® with well-characterized composition or properties, or both.
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Users of a NIST SRM or RM should ensure that the certificate/report in their possession is current. Find Current SRM/RM Certificates, Reports of Investigation, and Safety Data Sheets using the NIST Store’s Product Search Box.
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