Isometric Cube Drawing Ruler

I love to sketch and doodle when I am bored in meetings, however when I do want to take it more seriously I need to draw boxes, and cubes to help me realise a design I have been concepting - this Isometric Sketching Ruler from eternity labs is sure to make you smile when you draw your first perfect cube   Best Part - No Sketching paper needed!    Draw the first 2 lines - then simple follow one line around the whole cube to keep drawing its parts in  IMPORTANT INFORMATION - Scaling increments are in 5mm - make sure to Scale this by 2x ONLY as you will then change the spacing to 10mm between each line marker!