The Ambient CO Gas Analyzer from Vasthi Instruments uses non-dispersive infrared gas filter correlation technology to accurately measure the carbon monoxide levels in the air. co analyzer,ambient co, ambient gas analyzer,co gas analyzer,co analyser,co gas analyser, ambient gas,co analizer,fixed co analyser,caaqms,co analyzer working principle,CO analyze,Continuous ambient ozone mon... https://vasthi.com/product/29/ambient-co-gas-analyzer