Make accurate measurements of Z Scale models with this ruler. Measure from one to 180 scale feet, with graduated 6" measurements through five scale feet. Radius template includes pivot hole with three holes located at the radii of pre-curved Marklin track, and corresponding holes to locate the edge of cork roadbed. Reference line and ruler edge allow edge of cork roadbed to be located at straight track sections. Opposite side of ruler has a metric 20cm ruler. The ruler is transparent and is made of lightweight, durable plastic. Includes vinyl storage case.