Relatively new to being diagnosed with type 2

I’ve never tested at home before and decided to start trying it. But after reading about these home meters they can be off by as much as 15%. If that’s the case, aren’t I better off just not even using it and relying strictly on labs? 15% higher would be a lot for me and 15% lower would be great for me. So if I don’t know which number it actually is, I might as well not use it. Unless I am misunderstanding something.