This 4'' wheel is ideal for indoor measuring on smooth, hard surfaces making it perfect for adjusters, appraisers, decorators, painters and especially realtors. The ML1212 features a polyvinyl tread to improve traction while measuring. This 4" wheel is compact and lightweight for ultimate convenience. Adjustable twist and lock handle. Polyvinyl tread for improved traction. Magnifying lens for improved readability. Accurate gear-driven counter with push-button reset. Five digit counter reads up to 10,000'.