When you work on a construction crew, it is imperitive to have accurate measurements. You need to know how many feet to underground lines and pipes, etc. This wheel will do exactly that for you. Just push it along as you walk, and it will measure the distance for you without stretching a measuring tape, or needing another person to hold the end of the tape for you. You will get accurate measurements every time, and this counter offers a modern digital read-out.* Wheel Diameter 5 5/8" * Digital Counter To 9999.99m * Handle Extends To 34.25" * Counting Speed To 360rpm * Professional Quality