Works very well. I got it out of the box, placed it on my countertop and saw the bubble was off. I thought I had a bad level, then I remembered gravity doesn't work selectively, and I realized my countertop is not level. the magnet is handy, but it also means this item does not have any side worth using as a precise straight edge. Luckily, squares are not expensive.
Rating:
[5 of 5 Stars!]