The Helix 30cm K93X40 triangular scale ruler with 12 scales is ideal for professional use
- Scale features - 1:1, 1:10, 1:2, 1:20, 1:5, 1:50, 1:100, 1:200, 1:500, 1:1000, 1:1250, 1:2500
- Helix is renowned for educational and office products
