This dual precision molded one-foot circumference wheel offers increased stability and accuracy when measuring on a smooth, hard surface. The MM-12 Twin features a 5-digit, push button reset counter and a retractable twist-and-lock handle. Stability and accuracy come together in the MM-12 Twin Series. The MM-12 Twin adds an additional wheel for greater stability and traction. Real estate agents, law enforcement officers, construction workers and contractors rely on the accuracy and balance of the MM-12 Twin.