Which tool is used to mark lines parallel to the edge for seam allowances?

• A. Scriber
• B. Marking gauge
• C. Ball peen hammer
• D. Aviation snips

Answer: (B)

To lay out seam allowances, you need a line that stays a fixed distance from the edge. The marking gauge is designed for this: its fence rides along the edge while the scriber marks a line at the preset offset. Set the desired seam allowance, lock it, and run the gauge along the edge to produce a precise, parallel line that guides cutting or folding. This method is accurate and repeatable, unlike freehand marking. The scriber alone can mark a line but doesn’t maintain a constant offset from the edge; the ball peen hammer is for shaping metal, and aviation snips are for cutting, not marking.