The sole purpose of this tool is to plumb the planet and it can't even do that. The structure is very simple: A cord goes through the middle of a hollow knurled screw, which is screwed into a plumb bob at the top. The problem is that the hole for the screw it screws into a plumb was drilled and off-center by 0.031" (I measured it with vernier calipers). So when you hang it, if you rotate it slowly, it will hang at an angle. You can see how it vibrates. Also, the picture shows the tool is stamped "Made in USA" but the two I received were made in China and both were drilled off center. I would give it zero stars because it's only made for one thing and it can't even do that, but it's impossible.
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