Rulers we deal in are used for measuring the line in an efficient way. The straight edge made by them allow them to be used for cutting, drawing, and scoring. These must be used for technical drawing, engineering, carpentry, print fields, math & geometry. Also, these are needed to measure the length in both science and mathematics. Rulers can be used by students and professions of different orbits. The measurements and marks provided by them are accurate. Also, these are needed to measure lengths in both customary and metric units.