1. 4V1H1D 2. Laser Level 3. CE 4. Customize design packing available Building Material Making Machinery-Laser Level-4D (4H1V) Description:Laser wavelength: 635nmLaser class: Class IIAccuracy: ±1/4"/100ft. (±1.0mm ... and Align: Walls, Doors, Frames, Stud Beams, Windows and Skylights; Level Electrical Outlets; Stud and Curtain Wall Plumbing, HVAC, Plumbing, Pipe ...