Rotary Laser Levels produce a level laser line around a work space in 360 degrees as a reference of level. From there, all types of work can be done from site grading, pouring concrete, installing chair rails, installing fences, laying out foundations for building construction, installing drop-ceilings, and more. Some models are for indoor use only, and some models will handle indoor and outdoor use. Rotary Lasers are manual-leveling or automatic-leveling types (automatic-leveling are also sometimes called "self-leveling"). If you plan to use a laser that is made for outdoor exterior work, you will need a laser detector (detectors are also known as receivers or sensors), since laser beams cannot be seen by the human eye in bright conditions. Plus, laser detectors generally double the range of a rotary laser levels beam since a detectors eye is sensitive and can detect a beam from further away than a human eye can. Don't feel overwhelmed, we agree that there's a lot of rotary lasers to choose from and we generally recommend that you first define the tasks you're going to want to accomplish with your new laser. Then start looking at the features you might want, such as; plumb-up beam, plumb-down beam, variable rotation speed or fixed rotation speed, accuracy, or if a laser detector included or not included. View our selection of Rotary Laser Levels below. If you need help selecting a Rotary Construction Laser Level, please contact us as we'd be glad to help you make sense of the various models. We'll answer your questions, and also promise no sales pitch.