Initial Chk Ver Std in H2O,solution B only (µg/mL) Silicon at 100, Sodium at 160, Sulfur/Sulphur 200 in H2O. 12 months expiry date. Traceable to NIST 31XX series. ISO 9001:2015 certified, ISO/IEC 17025:2017 and ISO 17034:20166 accredited.
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