Abstract: A drafting instrument is disclosed that functions as a protractor, compass and ruler. The instrument is ideally suited for flat surfaces used for marking including: paper, dry erase board, chalkboard and drafting table. The instrument accommodates pencils, pens, chalks and markers and facilitates the drawings of arcs, circles and parallel lines. The instrument has a built-in protractor for measuring and drawing angles and multiple rulers for measuring distance and drawing straight lines. The preferred embodiment of the instrument is two-piece with an arm shaped main ruler and a single slide-ruler that freely slides in and out of the main-ruler. A place ring with thumbscrew is attached to the slide-ruler to hold a writing tool such as pencil, pen, chalk or marker.