Hanna pH 4.01 Calibration Solution, 20 ml, case of 25 pots-and-containers 3” thin with a recommended

3” thin with a recommended mounting height of 6”–12″ above canopy

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Hanna pH 4.01 Calibration Solution, 20 ml, case of 25 pots-and-containers 3” thin with a recommendedHanna's Buffer solutions are made from established formulas and are standardized with a pH meter that is calibrated to NBS NIST primary standard buffer solutions. The 20 ml sachets are ideal for infrequent calibrations while for heavy duty applications, you can choose from the popular 230 ml, 1 liter, or 1 gallon containers. Now the pH 4 buffers carry lot #, expiry date as well as pH C chart on every bottle. HI 7004L C and HI 8004L C are also supplied