pH Calibration Buffers Kit Colour Coded Essential Buffers for Two Point Calibration of pH Meters pH 4.01 (Red), pH 7.0 (Yellow) Simply select your required pH Value and Bottle Size from drop down - Product Code: PHCB - Various pH - Pack Size: 250ml, 500ml, 1L, 5L Description Highly accurate pH Buffer solutions for calibration of pH meters. pH Buffers used for calibrating pH meters need to be a known value of a certain pH, our buffers (manufactured in Manchester) are tested to a pH accuracy of 0.01 pH.
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