Lufkin® PSMW48N Professional Measuring Wheel, 12"Centerline wheel for increased balance and more accurate measurements. Gear based measuring system is more accurate and durable than traditional belt style counter. Bolstered folding joint allows for compact storage and longer product life. Allows for better merchandising in store. 12 1 2" wheel with rubber tire for superb traction on job sites with uneven terrain or long indoor expanses. 12 1 2" wheel with rubber tire for superb traction on job sites