Hanna pH4 Calibration Solutions -- 16 oz Cal Mag Additives The result of months of

The result of months of scientific research and trials is Grodan Gro-Blocks Improved with our Advanced Wetting Agent

9x Root Control Disc

filter wrench

This one is 140 mesh

This ensures that gardeners employing House & Garden receive high quality

Hanna pH4 Calibration Solutions -- 16 oz Cal Mag Additives The result of months ofHanna'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