Extra-rigid aluminum profile with reinforcement ribs, high stability and a secure grip when working, two vertical spirit levels for quick reading in any position, end caps with non-slip stopper, the spirit level stays in place when marking, shock-absorbing end caps, the two-component material mix protects the profile Punches, detachable end caps, precise positioning and marking right into corners, easy to clean thanks to the electrostatic powder coating, with two precisely milled measuring surfaces (coated from 183 cm), precise measuring in all positions, STABILA built-in technology ensures long-term precision, measuring accuracy in the normal position ± 0 .5 mmm, in reverse position ± 0.75 mmm, particularly suitable for craftsmen who have to subject the tool to high stress, for example in masonry and carpentry work, in timber construction, reinforced concrete construction, window construction, road construction, gardening and landscaping