This fits your .
3 different color grooves allow you to quickly and accurately select the desired scale.
Essential to student,architect,draftsman,civil engineer...for professional applications,architecture,engineering design,technical drawing...
Package Include:1*triangular metric ruler
30cm/12 Plastic Multifunctional Triangular Metric Ruler With Color-Coded Grooves For Architect Scale Charting Engineering Design - B071RC6ZJP