This Verulum Scale Rule from Blundell Harling is 30cm in length, the measurement markings have exceptional clarity and legibility as well as unequalled accuracy and design. The material this scale rule is produced from was specifically chosen for its toughness and stability.
No 2 features the scales: 1:5, 1:50x1:10, 1:100, 1:20, 1:200x1:500, 1:1000