Hanna pH 4.01 Calibration Solution, 16 oz bloom • 24V power supply

• 24V power supply

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Hanna pH 4.01 Calibration Solution, 16 oz bloom • 24V power supplyHanna's buffer solutions are made from established formulas and are standardized with a pH meter 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 # and expiry date as well as pH C chart on every bottle. HI 7004L C and HI 8004L C are also supplied with