Works well for the price. It's not much higher than the engineer's angle I used to align my tools. It agrees with reasonable accuracy in most places. Two things to note: 1.) Only the bottom rim has magnets. I really want at least one of the sides to be magnetic. 2.) Only angles on the vertical axis are measured. In other words, if you try to measure something while the instrument is on the back, it will simply throw an error. I suspect this is common for this type of instrument. I just didn't think about it before. All in all it's worth the money for 20β¬.
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