Formulated to provide exact values to an accuracy of +/- 0.01 pH @ 25 deg C, our colour coded pH 4.01 Buffer Solution (Red) is designed to be used in calibration of any pH Meter.
For a two point calibration ph 7.0 Buffer (Yellow) will also be required.
For a three point calibration, pH 7.0 Buffer (Yellow) and pH 10.01 Buffer (Blue) will also be required.