I would probably give it 5 stars but I have no way of testing its accuracy but I have had very good results. I have used this item to level my mini lathe and 3D printer, desktops etc and have had great results. oily finish for a day or so and if you let it hit some metal it can dent, doesn't seem the hardest metal but overall a pretty heavy block. Bottom line: I suspect you can't get a better level for the money, but you should really take care of this level.
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