Folding Rule 559, Contact-meter A folding rule made from downy birch with Swedish steel joints, affording thin sections and great flexibility. Internal metric scale on both sides depicted in black (centimetres/millimetres) and red (decimetres). Used for measuring directly on surfaces. Type approved as per EU Class III. Coated with a water-based protective lacquer for increased resistance to dirt and moisture. The joints are heat-treated, epoxy coated and oiled at three points to ensure first-class performance. Each folding rule section is checked twice during the production process using high-speed cameras.