Art Alternatives Plastic 12" Triangular Engineering Scale

Art Alternatives Triangular Engineering Scale, 12". This scale is designed to measure from reduced scale drawings, such as blueprints and floor plans, but also works as a handy all-purpose ruler. Designed with engineers in mind, this scale is fully divided with gradations of 10, 20, 30, 40, 50 and 60 decimal parts to the inch.