12" Measuring Wheel, Suitable for measuring vertical, horizontal or curved surfaces, the large Crescent Lufkin Professional Centerline SAE Measuring Wheel displays surface dimensions in feet and inches for quick, accurate distance calculations. It features a 12-inch wheel with a rubber tire for superb traction on the uneven terrain of jobsites or long indoor expanses. The analog counter dial calibrated to the wheel counts to 10,000 ft. before rolling over to 0.