This simple - just put the meter in the bag:
Did the PH 7 calibration first, needed to lower the value 0,8!
After this the PH 4 fluid didn't need a correction.... Now trying to find KCl which is harder to get then I thought
Did the PH 7 calibration first, needed to lower the value 0,8!
After this the PH 4 fluid didn't need a correction.... Now trying to find KCl which is harder to get then I thought