Stabila 96-M-2 Double Plumb Magnetic Levels made with a 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 & removable bi-material end caps. These end caps provide increased damping &, when removed, a cleaner marking line right into the corner. Note: Levels 150cm (60inches) & over have painted yellow faces to conform with the level of accuracy required in the Stabila range.