... 4V1H 2. Rotary Laser Level Pro 3. Red Line 4. With Alarm 5. CE, GS, ROSH 4V1H Rotary Laser Level Pro Model ... Number: ZY/SA05-4V1H Description:Laser wavelength: 635nmLaser class: Class ... Doors, Frames, Stud Beams, Windows and Skylights; Level Electrical Outlets; Stud and Curtain Wall Plumbing, HVAC, ... reference:Optional Parts: 4V1H Rotary Laser Level Pro