With the CO2nfirm Now™ CO2 detector from Covidien, now there's an effective assessment tool that confirms correct NG and OG placement and helps avoid inadvertent tracheal placement - safely, reliably and immediately. Only the CO2nfirm Now™ CO2 detector incorporates a unique colorimetric paper technology engineered to display an easy-to-detect change in color from purple to yellow within seconds when the presence of carbon dioxide is detected.