Bosch presents: The cross line laser UniversalLevel 3 - YouTube
Bosch Cross Line Laser UniversalLevel 2 Set (3 x AA batteries, in soft bag) : Amazon.de: DIY & Tools
Bosch presents: The cross line laser UniversalLevel 3 - YouTube
Two Types of Laser Levels — Alabama Woodworker
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) :