Bosch GLL55 50ft Cross Line Laser Level Self-Leveling with VisiMax Technology, L-Bracket Adjustable Mount and Hard Carrying Case, 4.4 x 2.2 x 4.2 inches - Amazon.com
Bosch 30 ft. Cross Line Laser Level Self Leveling with 360 Degree Flexible Mounting Device and Carrying Pouch GLL 30 S - The Home Depot