NIST SRM 1877 High-Fired Beryllium Oxide as Beryllium at 1 µg/filter on Millipore AAWP 37 mm, 0.8 µm porosity MCE filters. 2 filters. 12 months expiry date. Traceable to NIST 3105. ISO 9001:2015 certified, ISO/IEC 17025:2017 and ISO 17034:20166 accredited.
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