This Reiss 3227 Hyperbolic Slide Rule is a remarkable tool that offers 30 scales x 25cm for precise calculations. It was manufactured in Germany and is made of durable duplex plastic. This slide rule is perfect for professionals in the engineering and science fields and is also a great addition to any collector's collection. With its unique design and functionality, this slide rule has been tested and proven to be accurate for solving complex mathematical calculations. It is a rare find that is highly sought after by collectors and professionals alike. Don't miss out on the opportunity to own this piece of history.