With two small precision-molded wheels, the dual-wheel stability makes it easy to measure curved, horizontal and asymmetrical surfaces. Wheels are 4" in diameter and have a circumference of 1'. The 5-digit, easy-to-read counter measures up to 9,999', 11" (nearly 2 miles) without resetting. Telescoping handle for compact storage. Weighs less than 2 pounds. Made in the USA.