The Rotring Triangular Reduction Scales is a professional tool made from high-quality durable materials, perfect for planning drawings, scales & measurements. Suitable for professional use or students. Triangular Reduction Scales High-polished surface Precision divisions numerated both ways Dimension markings in cm & m for easier working Two coloured flutings for easy recognition of scale Reduction Scales 1: 20 1: 25 1: 50 1: 75 1: 100 1: 125