- Measuring Wheel
The measuring wheel is used to measure distance on a trail. It records the revolutions of a wheel and hence the distance traveled by a wheel on the trail.
Measuring wheels are used to measure distance for guidebook descriptions and in surveys to locate spots where work has to be done along the trail.
Ed called his measuring wheel a "cyclometer", which is also true, and sounds almost interesting. But still isn't, as you can tell if you've ever seen one.