Chalk Line

Description A line of string covered in chalk that helps you create straight guide lines for any / all project striping / markings.
Typical Dimensions N/A 
Estimated Cost $6 - $20 (powdered chalk usually sold separately, ~$8) 
Durability Demo: 1 day to 1 month installation / Pilot: 1 month to 1 year installation / Interim: 1 year to 5 year installation

All Projects Can be used to create guide lines for striping / markings to set up projects of any durability. 

Fill chalk line with powdered chalk. Shake. Pull string out to desired distance. Pull gently until taught. Lift string off the ground and release on desired surface.
Be cautious pulling the line out for the first time, as the line may snap if you are not careful. 
Requires at least two people, three if snapping distances more than ~20 ft. 
Wear work gloves to avoid chalk-stained hands!

Borrow from a local hardware store or use your own.  
Purchase from a local hardware store.