Made of lightweight aluminium. Measuring accuracy: 0.5 mm. 0.5 mm/m accuracy in normal position and 0.75 mm/m in overhead position. Cylindrical vials with spirit level liquid that is resistant to UV light and extreme temperatures. Sensitivity: 10 mm/m. Easy to read. Radius of the vial: 200 mm. Unbreakable vials with 2 lines per side for easy use. Aluminium profile with a wall thickness of 1.4 mm. Lightweight aluminium profile: 520 g/m.