Review on Accurate Bullseye Inclinometers for Precise Furniture Measurements by Josh Maher

Slightly disappointing. There should be a black dot in the center of the circled rings, but there isn't. If you compare the bubble to the inner ring, you see this. The inner circle and the bubble are what you need to compare for alignment. One of the sets is unused. The rest required light sanding of the base for greater accuracy. Then they are very good, but not perfect. Could be improved but don't expect too much.