Floyd:

That's why I use a real analog meter - digital has too many issues when the known electrica potential between different soil sources differs. Analog meters deal with straight pH thru electron motility not the BS shit digital meters do with electrical differnce.

But then again, most people wouldn't have the material science background to know an aluminum and copper probe would give a far more accurate measuring of pH since we know how aluminum and copper affect pH after nearly 200 years.