The Johnson 1718-7800 Box Level is the perfect solution for all your leveling needs. It features three vials that are easy to read and an aluminum frame that provides maximum durability. The 78 in. box level has a rare earth magnet type, which makes it ideal for use on ferrous metals such as iron and other magnetic materials. With a total of three vials, this level offers the best possible accuracy with +/-0.039 in.. It has an aluminum frame with straight wireway length of 78 in., which makes it lightweight and easy to carry around. The Johnson 1718-7800 Box Level is perfect for your next project because of its high accuracy and durable design.