Growth Technology pH Buffer Solutions 4 & 7
Pour out a small amount into the handy measuring lid tthen place your pH meter in the solution. Try to ensure the solution is room temp. as some meters do not calibrate correctly if the solution is too cold or hot.
It is important to discard the used solution when your meter is calibrated and ensure you do not pour it back into the container as it will contaminate your new solution.
. First use PH buffer 7 solution to calibrate your meter to neutral, once this is done we recommend you then use PH buffer 4 to calibrate your meter to this level, this will give you a two point calibration and be far more reliable than just calibrating to one.