Komelon DW12 Series dia feet/inches twin measuring wheel is ideal to use on hard indoor or outdoor surfaces. Wheel provides stable and accurate measurements. Measuring wheel. Dual 4"(Dia. ) wheels. Measures in feet/inches. Its 5 digit counter measures up to 10,000 units. Equipped with a telescopic aluminum handle. Durable twin wheels for stable and accurate measuring on hard indoor and outdoor surfaces. Komelon DW12 Series dia feet/inches twin measuring wheel has a 5 digit counter that measures up to 10000 units and features a telescopic aluminum handle.