The Empire 48" True Blue Aluminum I-Beam Level (500.48) offers superior performance in all key areas of user needs and functionality. Exclusive high contrast vial surrounds make viewing easier in all light conditions and feature impact resistant acrylic mono vials for reliable durability. An all metal frame offers superior durability and protects long life accuracy to within 0.0005 in. per inch in all working positions. Each level is equipped with impact-resistant end caps to withstand the harshest jobsite conditions. For added utility, the 500 Series features a top-read window for clear overhead viewing and has built-in molded grip zones for enhanced portability. Magnetic models include a high-strength continuous magnetic edge which provides users maximum holding power when measuring door frames, steel studs, ferrous pipe and other common metal-working applications.