You'll always get the exact answer with this multi-purpose desk accessory! Our calculator ruler consists of a solar calculator, magnifier and protractor in one. Made of ABS (acrylonitrile butadiene styrene) plastic, this versatile mathematical tool features measurements on both sides of the ruler, and includes both inches and centimeters. No student or accountant should be without this digital numbers cruncher. Also perfect for construction firms! Primarily used for advertising; not a precision instrument.