What is a 4D /16 line laser level? Huepar Professional Laser Level 4D laser level has Two 360 ° horizontal planes and two 360 ° vertical planes, which can measure the horizontal and vertical, the right angles in four directions of the ground or zenith, and the vertical points in space. Also, it has an intelligent warning function too, which can automatically warn when the machine is not in the horizontal plane, to ensure the accuracy of use. In the range of self-leveling, the automatic self-leve