Which tool is used to scribe parallel lines on metal from one datum edge?

• A. Odd leg caliper
• B. Engineers mitre square
• C. Combination square
• D. Spring dividers

Answer: (A)

To draw parallel lines from a reference edge, you need a tool that can run against the edge while keeping a fixed offset for the scribed line. An odd-leg caliper does this naturally: the longer leg acts as a fence against the datum edge, and the other leg carries the marking point. As you slide the tool along the edge, the mark is laid out at a constant distance from that edge, giving a true parallel line.

Engineers’ mitre square is mainly for checking or laying out right angles, not for offset parallel marking. A combination square can mark at a set distance or perpendicular lines, but it isn’t as direct for producing a continuous line parallel to an edge. Spring dividers are for transferring distances and drawing circles or arcs, not for marking parallel lines.