Triangular Scale, Plastic, 12″ Long, Engineering, Color-Coded

The color coded center groove easily identifies scale graduations. Measurements are precision-etched into a durable laminated plastic for accuracy. Comes in a protective case. Engineering Scales?Color coded, 10; 20; 30; 40; 50; 60 parts per inch. Ruler Type: Triangular Scale; Length: 12″; Standard Scale: 10″; 20″; 30″; 40″; 50″; 60″; Material(s): Plastic.