Designed to fit easily in your toolbox and handle almost any leveling need, the Empire 30 cm True Blue magnetic tool box level features a vari-pitch vial that reads slope or pitch in in/ft. 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.