pH Calibration Buffer Colour Coded pH 4.01 and pH 7.0 4.01 - Red, 7.0 - YellowThis pack contains 250ml of each pH Value (2x250ml) - Product Code: PHCB47-C - Pack Size: 2 x 250ml 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. Colour Coded for ease of identification and two values are required in a TWO point calibration process, pH 4.01 (Red) and pH 7.0 (Yellow). pH 10.0 is used in a Three Point calibration or as an alternative to 4.01/7.0 in a two point calibration. When calibrating it is advisable to only use a small amount (50ml) of each buffer in two .
eBay