Multielement cal std 1 in 2% HNO3 (µg/mL) Beryllium at 50, Boron, Cadmium, Manganese, Zinc at 100, Selenium at 200, Arsenic, Lead at 500 in 2% HNO3. 12 months expiry date. Traceable to NIST 31XX series. ISO 9001:2015 certified, ISO/IEC 17025:2017 and ISO
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