pH 1.68 is a common low-range pH meter calibration point. All Environmental Express pH buffer solutions are manufactured under ISO 9000 quality guidelines and traceable to NIST standard (for meters with 0.01 resolution). A pH/temperature table is printed on the label for accurate calibrations.

pH 1.68 buffer solution is colored red for visual reference. It is sold in individual 500-mL bottles and available in cases of 12. If unopened, shelf life of pH 1.68 is 2 years.

Store buffers away from direct sunlight.