Calculated Industries, Inc 6530  Wheel Master Classic Measuring Wheel Measures up to 9,999 feet, 11 inches with 99.7% accuracy (+/- 1" in 30') Easy to use, accurate and reliable - comes with 2-year warranty 12.5" diameter wheel; folds to half size (from 41" to 22") for easy storage and portability Reflective safety tape Convenient, flip-down kickstand