The G6000A Portable Laser Gas Telemeter consists of an opto - mechanical system, a signal - processing system, a display and alarm system, and a housing assembly. It's mainly used to remotely measure the concentration of methane or methane - containing gases, applied in rapid location detection of gas pipeline networks. The telemeter emits an infrared laser to measure the gas mass concentration between the detection point and itself, and also a visible red laser for easy observation.