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 architects in mind, this 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.Details:12" (30.48 cm)Features easy-to-read gradationsColored grooves make it easy to identify scaleDurable plastic construction