Huepar 902CG laser level unboxing Design 4D laser level is a compact, practical option for basic cross line leveling work. Laser level 16 lines 4d self-leveling 360 degre rotary horizontal vertical green the seller is aprisas and is located in hong kong. (Left Side)automatic leveling when the pendulum is unlocked, the pendulum is free to automatically level, in order for the cross line laser to automatically level, the base of the unit needs to be within 5° of level.