The pll 2 is a cross line laser with an integrated digital display which shows the angle of the laser line being projected the cross line laser is perfect for aligning pictures shelves light fixtures etc on a wall the incline function allows you to do this perfectly level or at a predefined inclineslope this means you can have wallpaper tiles patterns etc at any desired angle the incline function not only makes the pll 2 perfect for projecting a laser line at a predefined angle but