Extra-rigid aluminum profile with reinforcement ribs for high stability and handle opening for optimal handling (length 122 cm with two handle openings), two integrated LED light sources ensure intensive, even illumination, optimal readability of horizontal and vertical vials, even in poor visibility , battery-saving AUTO-OFF technology, end caps with non-slip stopper ? 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, spirit level with two precisely milled measuring surfaces, no discolouration on surfaces, STABILA installation technology ensures long-term precision, measuring accuracy in normal and reverse position ± 0.5 mm, for all craftsmen who often have to work in the dark or with poor visibility, especially in heating construction, reinforced concrete construction or electrical installations