Co2 mai tashi Laser na'urar alama shine zaɓi na farko don alamar kwanan wata akan kwalabe na filastik da kwali.Na'urar firikwensin yana motsawa tare da bel mai ɗaukar hoto don gano abin, yana aika sigina zuwa na'ura, kuma shugaban laser yana fitar da haske a wurin da aka keɓe, yana yin alama daidai akan abin.