The VQ601/3 with Air Quality Sensors VQ1 Pellistor VQ600 Hd 0.75"14NPT is a high-performance air quality sensing module manufactured by Amphenol. It is designed for reliable, continuous and precise monitoring of a number of different air pollutants, such as Carbon Monoxide (CO), Nitrogen Dioxide (NO2), Hydrogen Sulfide (H2S), Oxygen (O2) and Hydrogen Chloride (HCl). The resolution of the whole system is 0.05ppm and the accuracy is up to +/-1.2%. The device is also equipped with an integrated temperature compensation feature, allowing accurate measurements even in varying conditions. Furthermore, the module is provided with a galvanic isolation between the sensor and the amplifier, ensuring reliable and accurate measurements. This device has been designed for applications where precise and accurate air quality monitoring is important and can be used in both residential and industrial setups.