GasEye open path analyzer provides sensitive and selective measurement of gas components directly in atmosphere. This analyzer provides unattended 24/7 operation scheme, short response time and requires almost no maintenance after installation. Both monostatic and bi-static versions are available. Monostatic version consists of a combined transmitter-receiver unit and retroreflector and is suitable for long distances operations (up to 1 km). Bi-static version consists of a separate transmitter and receiver units and is suitable for moderate distances (up to 100 m).