![Triangular Scale Ruler](http://kingsstationersart.co.uk/cdn/shop/products/DARTS_scale_rule_{width}x.jpg?v=1627480124)
A high quality 30cm triangular scale rule showing scales:
1:10, 1:20, 1:25, 1:30, 1:40, 1:50
1:100, 1:200, 1:250, 1:300, 1:400, 1:500
A high quality 30cm triangular scale rule showing scales:
1:10, 1:20, 1:25, 1:30, 1:40, 1:50
1:100, 1:200, 1:250, 1:300, 1:400, 1:500