Hanna pH 7.01 Calibration Solution, 20 ml, case of 25 ph-ec-tds-meters-and-solutions Actual lifespan will vary depending

Actual lifespan will vary depending on your water quality and usage volume

Efficacy: 2

which automatically detects the input voltage without the use of a DIP switch or selector pins

Power source: 3 x 1

• 100% larger & easier to read LED display

Hanna pH 7.01 Calibration Solution, 20 ml, case of 25 ph-ec-tds-meters-and-solutions Actual lifespan will vary dependingpH 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.).