It may look like a tennis ball but this deceptive little package projects a laser line in any direction you choose The fourway bubble level makes it easy to get level & plumb lines so precise no one will believe you did it yourself Finally a laser level thats so easy even a novice gets it right the first time It may look like a tennis ball but this deceptive little package holds a laser that projects level or plumb lines so precise no one will believe you did it yourself Its great for leveling & aligning pictures shelves cabinets mirrors & more It all begins with the mounting cup Attach it to any flat surface with the nonmarring selfadhesive discs Pop the Laser Ball 360 laser level into the cup turn it on & it starts glowing a cool blue Rotate the ball in the cup to create a horizontal or vertical line Point the laser toward or away from the wall to adjust the lines length A final check of the 4way bubble will let you know the line is level or plumb & thats it No dusty chalk No confusing measurements For more complicated jobs use two Laser Ball 360 laser levels together & keep your anchor points lined up on both horizontal & vertical axis Dont need to find level or plumb Use the Laser Ball 360 as a laser chalk line in any direction to line up tile or hang a hand rail for stairs Give Laser Ball 360 a try today & everything in your life will start looking straighter than ever