A 300mm/30cm triangular scale rule.

The triangular design of this scale ruler gives a perfect grip that is vital for accuracy when working on technical drawings.

12 scales between 1:10 & 1:500

The rule has 3 coloured flutings indicating the scale:

• Yellow - 1:10, 1:100 & 1:20, 1:200
• Red - 1:30, 1:300 & 1:40, 1:400
• White - 1:25, 1:250 & 1:50, 1:500