pH 7 is the most frequently used pH buffer. All Hanna solution bottles come with a pH Vs. Temperature chart together with the production lot # and expiration date to guarantee maximum accuracy.

Formulation Hanna pH buffers are made of Potassium Dihydrogen Phosphate and Disodium Hydrogen Phosphate and are standardized with a pH meter that is calibrated to NIST primary standard buffer solutions (NIST 186Ie & 186IIe and NIST 158g S.R.M.).