Horizont EXACTA 3 spirit levels, ACCURACY 0.3MM / M = 0.017 ° (IN BASIC POSITION), reinforced ALU profile 2.2 mm, milled base, liquid in UV spirit levels stabilized and fluorescent, optical horizontal spirit level - easy and more accurate measurement, double rings in spirit levels allow to set the inclination 2%, the spirit level is resistant to operational shocks, EACH PIECE ELECTRONICALLY TESTED. [***]