Compact, lightweight and strong frame. Accuracy certified for both top and bottom readings. Strong, wide frame design. Aluminum rectangular profile with reinforcing ribs for high stability and secure hold while working. Integrated anti-slip stoppers allow for a firm hold when marking. High quality vials for optimum readability - highly transparent, hard-wearing acrylic glass with precision-ground inner contours and fluorescent vial liquid. Locked-in vials are pre-calibrated. Removable plastic end caps protect the profile against impact. Caps grip walls and prevent gouges in drywall. Electrostatic powder coating makes it easy to clean. Especially suitable for use in the fields of tiling, carpentry, landscape work, as well as reinforced concrete construction. Accuracy guaranteed for life.