Can we use the cleangrow probe to measure soil?
Yes, the general protocol used is to extract the free ions in from the soil using a soil to De-Ionised water ration of 1:1 or 1:1.5 or similar, whatever is preferred in your lab.
Filtering is preferred to avoid abrasion of the sensor tips, but not necessarily needed if care is taken to preserve the tip surface which is the most important area of each sensor tip
Download a general protocol below