Y.S.PARK developed the first tool for anyone to accurately measure hair. This tool is to meaure precisely, which has been cultivated as a feeling until now. This tool is a third person used to cut precisely and teach the next generation. The pointed end shape of the tool fits the scalp easyily to measure the length and angle of the hair.This tool is great for education and demonstrations at the salons or schools. The ruler has measuring angle at the end 90°.