Alumicolor 6" Engineer Pocket Scale  Measure scaled engineering drawings and plans with this compact 6-inch triangular engineer scale . Its lightweight extruded aluminum construction and permanently photo-anodized calibrations make it a convenient, durable measuring tool for engineers, surveyors, designers and students. Key Features 6" triangular pocket scale offers a portable, pen-sized format for engineering drawings and plans. Features 10, 20, 30, 40, 50 and 60 parts-per-inch engineering calibrations. Extruded aluminum construction combines lightweight portability with everyday durability. Photo-anodized calibrations provide a smooth measuring surface with markings designed to resist wear and rubbing off.