Green 360 Professional Line Laser Level Ceiling Kit - China Laser Level, Line Laser Level | Made-in-China.com
Using line laser to square a ceiling fixture : r/DIY
Bosch cross line laser UniversalLevel 3 with tripod (3 laser lines incl. vertical line at 90° angle for an additional laser cross on the ceiling and bottom plumb point for precise alignments) :
Why Use A Laser Level For A Drop Ceiling | Storables