A Stainless Steel 500mm Digital angle rule 1m rule that calculates angles quickly and accurately. Ideal for woodworking, construction and machining. The Ruler is marked with both metric and imperial scales. Digital display for angles. Stainless steel rule with metric/imperial scale, scale length 500mm and 18 inch. Measuring range from 0 deg to 360.0 deg with accuracy of /- 0.3 deg. Rule locking function.