1. ONE horizontal line and ONE vertical line 2. Auto update level 3. Universal level bubble 4. With Alarm ... Model Number: YX-SA12 -1V1H Description:Laser wavelength: 635nmLaser class: Class IIAccuracy: ±3/8"/100ft. (±1 ... , Doors, Frames, Stud Beams, Windows and Skylights; Level Electrical Outlets; Stud and Curtain Wall Plumbing, HVAC, ... 1V1H Green Liner/Lithium Laser Level (1)