The Hultafors STL 150 Ruler, comes in tempered stainless steel, and has a matt chromeplated surface for anti-glare reading. The ruler is graduated in millimetres along the upper edge and half-millimetres along the lower edge. The reverse side is blank, the ruler is both metric and imperial. Specification:Size: 150mm (6in).Tolerance: ±0.3 mm/m