Laser marking machine uses high energy laser which is generated by laser source to Irradiation the material. The surface of the material absorbs laser energy, which causes the surface of the material to gasification , Staining，annealing and melt to form a permanent mark. Co2 laser marking machine is one kind of the laser marking machine use Co2 as the source . we have metal tube Co2 laser marking machine and glass Co2 laser marking machine , here is three best hot sale type of the Co2 laser marking machine.