This all terrain measuring wheel has a plated steel disk wheel that permits easy movement through brush etc. This wheel is great for measuring cross country courses, track intervals, fields, and many more applications. It's neoprene tire provides positive traction. The counter is clearly visible while you measure in an upright position. The automatic brake prevents accidental back tracking, and the built-in stand keeps the wheel upright when stationary. Records to 100,000 ft. on counter. The side wheel calibration is in 1/2 inch on one side, 1/5 of a foot on the other side, for estimating measurements less than 1 foot. The wheel has a 4 ft. circumference and 15.5-inch diameter. Handle folds for storage. Available in metric units. Three year guarantee.