Great if you can make this work. My questions would be how long does a probe last before you have to re-jig it? Does it work with sandy soils? Clays? To what ex

Great if you can make this work. My questions would be how long does a probe last before you have to re-jig it? Does it work with sandy soils? Clays? To what extent do readings swing massively based on soil substructure and poor contact/other random chance? Does it internally capture material and create liquid solutions to get around this problem? What range of data can you sample? Ideas: Don't just target industrial agriculture, consider the residential and commercial garden and surveyor markets. For inspiration or allies, look at the mining industry's established ecosystem of prospecting and sampling related service and software companies. They could also be customers: with open cut mines, they often have to do site remediation, eventually, and it's well funded.