The Milwaukee Digital Measuring Wheel is used to accurately measure distances on large or uneven surfaces. It is characterized by efficiency and ease of use. It can be operated with one hand via the digital display on the handle. The backlit screen is IP54 rated and features a clear interface that allows you to store up to 4 measurements, measure and convert to imperial, metric and engineering scales, and hold and clear measurements at the touch of a button. 2 AA batteries power the wheel. The instrument weighs 3.1 lbs.