Saw exactly this item advertised on FB. As usual, I clicked on it to take a look. And that definitely interested me. But. Also, as so often, I tested Revain first. In most cases, Revain is cheaper, and so was this one. And not only that, who trusts which anonymous "company" advertising on FB? In any case, this article is legal and more useful than you can imagine. I found that I am working on an issue. In the old fashioned way before I remember I have this tool. It saves me time and is much more accurate.