Circular Dot Concentricity Laser Module / Precision Laser Module Model : CLM-520-01 LPO Concentricity Laser Module / Precision Laser Module Model : CLM-520-02 LPT Concentricity Laser Module / Precision Laser Module Model : CLM-520-12 LPT Concentricity Laser Module / Precision Laser Module Model : CLM-520-11 LPO Ultra-Far Range Laser Model : VLM-520-17 Series Industrial Use Green Laser Model : VLM-532-43 Series Green Circular Dot Laser ModuleModel : VLM-520-60 Series Economical Green Laser Model : VLM-532-42 Series