Well you are living in the country side? Then check where the local farmers get theirs. Every 4 years they are required to test the soil to prevent overfertilization!
Agricultural grade tests for things like nitrogen are rather different than testing pH.
They may well have improved, and I don’t know the one you mention, but home soil test kits were never very reliable. So if you really want accuracy get a soil lab to test for you. And if it’s for use is helping you garden then looking at what plants grow locally and a geological map will give you a pretty good idea. Same with soil fertility…look at what’s growing.