I'm a welder, so a strong magnet and an easy-to-read spirit level are very important! And that's what I got. BUT he came to my house where 45* was half a bubble. So I just used the horizontal and the vertical... THEN the horizontal bubble rolled around in her body and was now incredibly inaccurate! But fixed in the middle still works fine, but what I'm doing now is garbage in dollars. They need a new design so that all bubbles are as accurate as the horizontal average.
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