How would you say that a meter with two metal prongs could correctly measure the ph of soil?
The two prongs are of different metals. They cause a ‘Galvanic’ action between them in the presence of moisture in the soil. The flow of electrons between them causes ionisation which gives the ‘Conductivity’ of the soil as a pH reading. (It’s something like a ‘Thermocouple’ that measures temperature by the change in electron flow as temperature changes). Enjoy the Holiday and have a properous 2009.
