The Advent 2 in 1 Gap Tape Measure has a dual printed, non-reflective blade with clear and precise markings giving accurate, easy measuring. It is EC Class II accurate, meaning that it is accurate to within +/- 0.125mm per meter. The tape is fitted with a double ended self adjusting true zero end hook, which is attached by 3 rivets for durability. The reverse blade takes into account the length of the case for accurate measuring between two points.