Easy to use and adjustable: lockable heavyduty drawing compass. Needle points are used as a divider. Drawing smoothly center wheel adjustment. Measures external and internal dimensions and the distance between points. Suitable for carpenters: pencil compass for carpenter. This spring caliper has a strong but flexible bow spring, which gives a smooth and precise action. tool for craftsman, architect, carpenters, etc. Accurate measurement: This spring caliper has a strong but flexible bow spring, which gives a smooth and precise action. Commonly used in leathercraft, woodworking, metalwork, engineering, decorating, or for craftsman, architect, carpenters, etc. Usage: for geometry, drawing, drafting, measuring precise distances between two points and drawing arcs. Also used as an angle measuring tool for jewelry making. Use scenarios: Transferring patterns and marking circle radii in woodworking or carpentry projects. Creating leathercraft templates and marking precise stitch lines or arcs for leather items. Designing jewelry components that require accurate arcs and angle measurements during layout.