The ideal all round level for household or professional use. Three measurement scales in both inch and metric. Straight edge for better markings. Slope indicator rings for level, 1/8" and 1/4" slope per foot. Double bridged frame for increased strength as well as providing an uninterrupted surface for both drawing and scribing over the horizontal vial. Fast and accurate installations. One Horizontal (level) and two Vertical (plumb) vials. Light metal rectangular profile. Removable end caps with anti-slip wall grips. Measurement accuracy: In the normal position 0.029 deg. = 0.5 mm/m. Vials are guaranteed for life.