Inorganic Ventures' pH 1.68 Standard is a 250 mL certified reference material set in a water matrix for stability. This standard is Traceable to NIST and manufactured in accordance with our stringent Quality Assurance guidelines. One year Expiration Date . Size: 250 mL …

Inorganic Ventures' pH 12.47 Standard is a certified reference material set in a water matrix for stability. This standard is Traceable to NIST and manufactured in accordance with our stringent Quality Assurance guidelines. One year Expiration Date . Matrix: Water (H₂O)

Inorganic Ventures' pH 11 Standard is a certified reference material set in a water matrix for stability. This standard is Traceable to NIST and manufactured in accordance with our stringent Quality Assurance guidelines. One year Expiration Date . Size: various …