Calculated Industries 6540 Wheel Master Pro 12 Commercial Grade Feet-Inch Distance Measuring Wheel; + FREE Carrying Pack Measures up to 9,999 feet, 11 inches with 99.7% accuracy (+/- 1" in 30') Easy to use walking linear measurement tool, accurate and reliable - comes with 2-year warranty and Free Carrying Pack Hand brake on pistol grip for precise measuring; sealed, gear-driven transmission for durability, handy kickstand supports wheel Re-set the easy reading center-mounted counter from top grip handle or counter unit while rolling, walking or stationary Heavy duty 12.5 inch diameter wheel smooths rough terrain; collapsible handle folds to compact size (from 38" to 19") for easy storage and portability