Shop for Hand Tools at The Home Depot. The Black and Decker All-In-One SureGrip laser level automatically changes from red to green to easily identify when it is in a level position. With mark free technology, it attaches to a variety of non-porous surfaces. It will attach securely for up to 2 hours. It also has an audio signal for accurate leveling when out of site.The unit also has a magnetic attachment that flips to project laser left of right.