Triangular Engineering ScaleProfessional quality, bright white plastic triangular 12" scales. The gradations are easy to read and designed to be long-lasting, while the colored grooves make it easy to find the scale you want. Used in making or measuring from reduced scale drawings, such as blueprints and floor plans.
The architectural scale is divided in gradations of: 3, 1-1/2, 3/4, 3/8, 3/16, 3/32, 1, 1/2, 1/4 and 1/8 inches to the foot and a scale divided 16 parts to the inch.
The engineering scales are fully divided with gradations of 10, 20, 30, 40, 50 and 60 decimal parts to the inch.