Hanna pH4 Calibration Solutions -- 16 oz Ozone 5 - 500 ppm and

5 - 500 ppm and 0

RO membrane protection: Removes free chlorine that degrades TFC membranes over time

Double-Overwrapped Carton: Holds the 2 year shelf life for as long as the case stays sealed

it plugs into the UIS platform

Nor does a case sitting half-open in a stockroom

Hanna pH4 Calibration Solutions -- 16 oz Ozone 5 - 500 ppm andHanna's buffer solutions are made from established formulas and are standardized with a pH meter calibrated to NBS NIST primary standard buffer solutions. Now the pH 4 buffers carry lot # and expiry date as well as pH C chart on every bottle. HI 7004L C and HI 8004L C are also supplied with an analysis certificate. Hanna pH 4 buffers contain potassium hydrogen phthalate. They are standardized using a pH meter calibrated by primary standard buffer