The 48 in. Magnetic I-Beam level offers precision leveling accuracy in a robust and durable design. It features durable block vials, instead of standard vials, that provide leveling accuracies of +/- 0.0005 in. and enhanced damage resistance. Each base is designed with V-Grooves for accurate reading on both flat and rounded surfaces, and each end cap is constructed with over-molding for enhanced impact protection.