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. Stabila 196-2-180 Level 3 Vial. Length: 183cm (72in).
