Horizon spirit level with three levels, accuracy 0.5mm/m = 0.0285°, anodized abrasion-resistant surface, wall thickness of ALU profile 1.5mm, liquid in the levels is UV-stabilized and fluorescent, horizontal optical level - facilitates and increases the accuracy of measurements, spirit level it is resistant to operational shocks, 10-year warranty on spirit levels, EACH PIECE ELECTRONICLY TESTED.