The Keson MP401 Replacement Measuring Wheel MP401RSW is meant to be used for the MP401 Measuring Wheel. This steel and rubber wheel is designed to measure both outdoors and indoors. It will handle rugged terrain, as well. The 15.5 diameter wheel is designed to measure in feet only, so it is great for larger areas.
It is a good idea to keep a spare Keson MP401 Replacement Measuring Wheel on hand, in cause something happens to the original wheel. It is important to use the proper wheel, or the measurements will not be accurate.