Keson Large RoadRunner Measuring Wheel The large RoadRunner is best for longer distances on rough terrain. New 3-piece, pistol grip handle with quick-snap cam locks. The 5-digit, easy-read, magnified counter (9,999 feet & 10ths of any inch) subtract in reverse. The wheel is constructed of Kesonite which is a strong, dense metal/resin composite. Kesonite holds its shape better than metal and it’s stronger than a spoked or die cast wheel. The weight of the 12-1/2″ wheel makes it easier to use and more accurate on rough terrain.