Light metal rectangular profile with removable end caps, 2 vertical & 1 horizontal vial. With rare earth magnet system. Measurement accuracy: in normal position: 0.029° = 0.5 mm/m Overhead measurement 0.043deg = 0.75mm/m Extra strong, light metal rectangular profile with ridges for gripping & novel removable end caps made from two materials. These end caps provide increased damping &, when removed, a cleaner marking line right into the corner. Length: 120cm / 48in