The Stabila 196-2 levels are made from extra strong, light metal. They have rectangular profile and an extra strong ribbed frame, with rubberised hand holds. Their removable end caps incorporate anti-slip wall pads, which allow the level to be held firmly against a wall with one hand without slipping. Each level has 2 vertical vials and 1 horizontal vial. The levels have 2 milled measuring surfaces, except for the 180cm levels, which do not have any milled surfaces. Measurement Accuracy: in normal position 0.029° = 0.5 mm/m, overhead measurement 0.029° = 0.5 mm/m.