Designed to fit easily in your toolbox and handle almost any leveling need, the Empire 12 in. True Blue Magnetic Tool Box Level features a Vari-Pitch vial that reads slope or pitch in inches per foot. This makes it ideal for setting up a grade or measuring a slope. The True Blue blue-banded vials and top-read window help provide easy readings and the full-length aluminum frame offers exceptional durability, making it able to withstand a 10 ft. drop onto concrete and still maintain accuracy.