Blundell Harling Ltd. produce the UKs largest range of scale rules. Since 1948 they have specialised in catering to a more 'niche' market, manufacturing and distributing an extensive range of technical drawing equipment, for use by students, architects, engineers, specialist designers, draughts people, and graphic artists & many more. The Triangular Scale Rule 0363.01 is an excellent, professional, but affordable product, made to the highest quality. Completely clear & legible scales over a 12" space, thanks to both the colour-coordination used to differentiate them & the manufacturer's high level of experience in the field. Scales Include: 1:1 1:10×1:2 1:20 1:5 1:50×1:100 1:200 1:500 1:1000×1:1250 1:2500