For critical applications and metrology needs, Hach offers Certified Conductivity Standard Solutions with Certificate of Conformity and Traceability from our Accredited Laboratory (www.hach.com/coa). The certificate is reporting the exact conductivity value with related expanded uncertainty (k=2). Solutions formulated according to OIML and traceable through the reference material back to the fundamental electric units. They are offering a unique extended shelf-life period thanks to a premium aluminium packaging
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