None of them are designed for the kind of impact that occurs when you insert an electrode into a core of soil. However, for pH they work fairly well. For nitrate, potassium and some other ions, the reliability of recently developed on-the-go measurements remains in question.  -   Viacheslav Adamchuk     Quotes
None of them are designed for the kind of impact that occurs when you insert an electrode into a core of soil. However, for pH they work fairly well. For nitrate, potassium and some other ions, the reliability of recently developed on-the-go measurements remains in question. Viacheslav Adamchuk