The Swanson 12" Aluminum Tool Box level features a multi-pitch vial that reads slope or pitch in inches per foot. This is ideal for setting up a grade or measuring a slope. It has two top-read windows to help provide easy readings, & each vial has "Brightview" surrounds for easy reading. The extruded aluminum frame provides durability. This must-have level fits in your toolbox & will handle most of your leveling needs.