Our standard 41cm / 16″ aeronautical scale ruler found in flight schools and pilot bags world-wide, is cut from thick Perspex with beveled edges. The outer edges are marked with nautical miles in 1:500,000 & 1:250,000 scales. On the centre line, statute miles and kilometres are marked in 1:500,000 scale.
As part of AFE’s attention to detail, the scale ruler is 10nm wide (in 1:500,000 scale) to aid en-route safety altitude calculations. An aviation design classic.