level4dEODOJU Laser Level, 4 x 360° Laser Level with Tripod, Self Leveling Laser Level 4D Green Lazer Level 16 s Laser Level 360 Self Leveling for Construction, Picture Hanging, FloorExplore the differences between 3D and 4D laser levels in construction. Learn how they work and when to upgrade for ultimate precision on your projects.