Horizon spirit level with four vials, accuracy 0.5mm/m = 0.0285°, anodized abrasion-resistant surface, wall thickness of ALU profile 1.5mm, liquid in the vials is UV-stabilized and fluorescent, 3 horizontal vials - two inclined 1 and 2%, optical horizontal spirit levels - facilitate and increase the accuracy of measurements, the spirit level is resistant to operational shocks, 10-year warranty on spirit levels, EACH PIECE ELECTRONICLY TESTED.