The DeWalt DCE074D1R-QW is used when lowering a ceiling or when you want to add a decorative border. This laser has a horizontal laser line that provides a 360-degree view. This allows you to see the line across multiple walls. The laser has a large maximum range of 450 meters outdoors (45 meters indoors). The red laser line is also visible outside with receiver (not supplied as standard). The laser is self-leveling up to 8 degrees. This makes it automatically level and you are sure that you have straight lines.