Mars triangular reduction scale ruler Version 4 - a precision instrument for technical drawing at scaleThe Staedtler Mars 561 98-4BK is a triangular reduction scale ruler in Version 4 scale configuration, providing a 3-sided precision scale ruler for architects, engineers and technical draftspeople who require the specific scale ratios engraved in the Version 4 set.Version 4 carries a different set of 6 scale graduations than Version 2 - addressing different professional disciplines and national drafting standards. The triangular body provides 6 scales across 3 faces, allowing multiple drawing scales to be read without changing instruments. Rigid black plastic with clearly legible laser-engraved scale markings. A precision tool for serious technical drawing and drafting professionals who need the Version 4 scale configuration. Explore the full Staedtler range, rulers and scales and craft supplies.
