I really like this spirit level. It's thick metal, so I'm not worried about an accidental fall knocking it out of square. The bottles are easy to read and I like the variety of positions. The rules are useful too, but don't go to the end of the level like I'd like. The magnets on it are very strong. The spirit level "snaps" securely into the metal surface and it will take some effort to remove the spirit level. Be careful when holding it to a thin metal object (or turn it upside down so the magnets don't touch the object). All in all, the perfect tool bag for me.