extra-rigid aluminum profile with reinforcement ribs for high stability and grip openings for optimal handling and a secure hold when working, two vertical spirit levels for quick reading in any position, end caps with non-slip stoppers ? Firm seat of the spirit level when marking, shock-absorbing end caps, the two-component material mix protects the profile from impacts, removable end caps, exact positioning and marking right into corners, easy to clean thanks to the electrostatic powder coating, spirit level with two precisely milled measuring surfaces (coated from 183 cm ), high-precision measurement in all positions, STABILA built-in technology ensures long-term precision, measurement accuracy in normal and inverted position ± 0.5 mmm, particularly suitable for craftsmen who subject the tool to high stress and have to measure in all positions, e.g. and carpentry work, in timber construction, reinforced concrete construction, window construction, road construction, gardening and landscaping