Abstract: A flexible marking and measuring instrument which can be folded or rolled as may be desired or convenient comprising a plurality of preferably elongated, rectangular, flat, thin members parallel one with another and sequentially flexibly connected one to another whereby the marking instrument may be folded or rolled to fit in a pocket or tool chest and/or bent or flexed to follow substantially any surface such as, for example, an elongated pipe, board, inside and outside corners, or surface of substantially any configuration. The parallel members may, inter alia, be of the same or different widths, the instrument may be provided with portions that are foldable at the same or different angles, the instrument may be provided with edges defining predetermined angles, the instrument may be provided with marking holes, and/or the instrument may be provided with such indicia as may be desired including but not limited to dimensions in English and/or metric units and lines designating angles.