That is so funny - I was thinking the exact same thing, that looks like the same company as the worthless pH probes!
For outdoor I do think soil testing can be important, if you’re not getting good results it could be the answer. It’s going to cost you. I like KAR labs for water testing, the entry-level test is $60 and it goes up from there to test for some of the more exotic petrochemical pollutants.
That’s what you really need, I never get a good result from ph test strips, the color always looks the same. I did a KAR labs water test twice and both times the pH of my well water was 6.2. It’s going to cost you to have a real lab test your soil, extension service sounds like a good option
