Self-Leveling Laser Level, WESCO 3 360 3D Green Laser Level, 65ft Cross Line Laser Tool, Three-Plane Leveling and Alignment Laser Level Tool - Two 360 Vertical and One 360 Horizontal Line, Blue - Amazon.com
Makita Laser Level Review: SK103P Cross-Line - Pro Tool Reviews
Makita SK106GDZ 12V CXT Self-Level Cross-Line/4 Pt. Green Laser - Amazon.com