Stabila 96 2 extra strong double plumb ribbed box section levels are made from an extra strong light metal rectangular profile with gripping ridges and removable end caps made from two materials the removable end caps are also equipped with well proven patented anti slip stops has 2 vertical vials 1 horizontal vial and 2 milled measuring surfaces on levels up to 120cm levels over 120cm do not have milled surfaces measurement accuracy in normal position 0029 05 mmm overhead measurement 0043 075