Rule with marking function, when unfolded, the links result in a continuous straight edge, high-quality, specially selected beech wood from European forestry for optimum breaking strength and elasticity, embedded, hardened sheet steel joints with integrated steel spring ensure durability, ease of movement and precise locking, durable, weather-resistant paint for protection of the small wooden pieces and the scale, large digits for better readability, even in poor visibility, red tens for quick orientation, black scale with clear and distinct print image, cmmm scale on both sides of both scale edges, complies with the MID directive valid for Europe, with CE - and metrology marking as well as EC type examination certificate, accuracy class III