pH Buffer 4 300ml

Ph Buffer 4 300ml Free Syringe 1St Class Post Growth Technology PH buffer 4 and 7 solutions are of a known and fixed PH, which is used to calibrate your PH meter and should be done on a regular basis to ensure ongoing accuracy from the meter. Pour out a small amount to use for calibration and remember to discard the used solution when finished, do not pour it back into the container as it will contaminate your new solution