I’ve been looking at them, but I saw that the “review” sites that checked the results of several of the most popular against both each other & against the results from samples sent to labs gave them pretty bad ratings for accuracy, and even repeatablity.
I’m going to continue researching options.
You know that jogs my memeory. I saw a book listed that could help you diagnose soil issues based upon the kind of weeds that grow there, and various crop symptoms.
I can’t remember where I saw it, and I didn’t bookmark it. Maybe as you are researching, you will come across it.