The Stabila R-Type Levels have been developed for the toughest building site conditions. They are extremely robust, with an innovative 5 chamber aluminium R-profile with torsion rigidity. In addition, the levels have removable and shock-resistant ends with patented Stabila non-slip stoppers. The levels have an extra wide measuring surface (4cm), making them extremely stable and ensuring that they do not tip over during measuring. Three clearly guided marking edges, along with a web over the horizontal vial, allow marking or cutting over the full profile length. The R-shape of the profile provides a comfortable grip, acting as a finger groove over the full length. This allows perfect handling during measuring and transport. Measurement Accuracy: In normal position: 0.029� = 0.5mm/m. Overhead Measurement: 0.029� = 0.5mm/m. Stabila R-Type Level. Length: 183cm (72 in) Includes X1 Stabila 1800cm Level X1 Pai Replacement EndCaps X1 Spirit Level Bag