Measuring WheelThe Zenport WM100 4 inch Walking Measuring Twin Wheel is designed to accurately measure distances on smooth hard surfaces up to 10,000 feet. Use it to measure on flooring, countertops, or smooth pavement in feet and inches, down to 1 inch. The dual molded wheels have a 4 inch diameter and allow stability and control for precise measurements. The lightweight aluminum handle quickly collapses down from 30 inches to 19 inches for easy storage.