Hanna pH 7.01 Calibration Solution, 20 ml, case of 25 featured At the heart of both

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Hanna pH 7.01 Calibration Solution, 20 ml, case of 25 featured At the heart of bothpH 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 calibrated to NIST primary standard buffer solutions (NIST 186Ie & 186IIe and NIST 158g S. R. M.).