Ever since I was a kid watching my dad use a chalk line, I was curious about the simplicity of its design. A chalk line can be used to mark a long straight line on a wall or as a plumb bob. Inside the polypropylene casing is 100 feet of string which sits in a purple chalk. Extend the line from one point to another and then “ping it” and a purple-coloured line appears. The external crank handle is used to rewind the line. Turn it perpendicular and you have a plumb bob. So simple, so effective, and what’s not to love about chalk lines!
Here’s a video showing you how to use a chalk line.