Compass Topex 125 mm with guide rail model 31C701 measuring tool

The Topex Compass 125 mm with guide rail model 31C701 is a manual drawing and measuring tool designed for controlled radius marking and precise circle or arc drawing. With a 125 mm span and an integrated guide rail, this compass offers stability and repeatability for technical drawing, drafting, woodworking layouts and educational use. The compact construction and handheld format make it suitable for use at a drawing board or directly on workpieces where a defined radius is required.

Advantages

The compass provides a fixed 125 mm maximum span and an integrated guide rail that helps maintain a steady drawing path, reducing slippage and improving accuracy. Its construction is compact and lightweight for comfortable handheld operation, while the adjustable point and holder allow use with pencils or marking styli. The tool's simple mechanical design makes it durable and easy to maintain, suitable for repeated use in workshop or classroom environments.

Suitable for

• Technical drawing and drafting tasks requiring precise circles or arcs
• Woodworking layouts and marking radii on panels and boards
• School geometry lessons and practical exercises
• General workshop marking where controlled radius and repeatability are needed

Key specifications

• Maximum span: 125 mm
• Integrated guide rail for improved stability and guided motion
• Handheld, manual operation suitable for pencil or marking stylus
• Compact and lightweight construction for portability

How to use

Place the compass point at the intended center of the circle or arc and align the guide rail along the surface to be marked. Adjust the pencil or marking stylus in the holder so the tip contacts the material at the correct radius. Hold the compass steady by applying light downward pressure on the guide rail while rotating the compass around the central point to draw the circle or arc. For repetitive markings, maintain the same center point and guide alignment to ensure consistent radii.

Usage recommendations

Use a sharp pencil or appropriate marking stylus for clear, accurate lines. Verify the center point and guide alignment before each marking. When working on delicate surfaces, test on a scrap piece to confirm pressure and marking quality. Store the compass in a protective case or drawer to prevent bending the point or damaging the guide rail.