Cross Line Laser. What are they? & What can they do? - RedBack Lasers
Milwaukee Green 100 ft. Cross Line and Plumb Points Rechargeable Laser Level with REDLITHIUM Lithium-Ion USB Battery and Charger 3522-21 - The Home Depot
Cross Laser Diode - 5mW 650nm Red : ID 1058 : $8.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Adjustable Cross-Hair Red Laser Module
5mW Red (650nm) Mini Cross-Line Laser Module (9mm) - OdicForce
650nm Red Cross Line Laser Module, Laser Cross Line Generator, Laser Modules | Berlinlasers