pH Calibration Buffers Colour Coded pH 4.01 (Red), pH 7.0 (Yellow) pH 10.0 (Blue) Simply select your required pH Value and Pack 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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