Buffer Solution, pH 4, 40mL, Pack of 3

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Sper Scientific offers a wide selection of pH calibration and buffer solutions. Always choose a pH 7 buffer plus at least one other pH value close to your expected measurement range. Using solutions of known pH value allow you to adjust the system to read accurate measurements. Calibration should be performed before each reading or each set of readings. pH buffers allow you to adjust your testing system to measure your samples' unknown pH more precisely.Available in pH 4, 7, and 10Packaged in 40 mL bottles3 bottles per pack