The STABILAA Plate Level 2 Type 106T takes a plumb reading from the bottom plate to the top plate of your wall to ensure that they go in straight. It extends from seven to 12 feet to fit into many different sizes of walls. This box beam level has 1-5/8-inch removable stand-offs to help it reach around braces. The frame is reinforced to provide the durability you need on heavy-duty jobsites. The Stabila plate levels rail is sealed and made from solid metal to keep it rigid for more precise measurements. A printed scale on the extension allows you to preset the level to your desired length. Two vertical vials and one horizontal vial allow you to find correct level and plumb.