Check the listing for details. TPI 707 Carbon Monoxide Analyzer. Condition: Used, Made in United States. Listed at 149.99 USD. The TPI 707 Carbon Monoxide Analyzer is a gas and combustion analyzer designed for precise measurement of carbon monoxide levels. Manufactured by TPI in the United States, this carbon monoxide analyzer is a reliable tool for detecting and analyzing CO concentrations in various applications. Its accuracy and efficiency make it a valuable asset for ensuring air quality and safety in industrial settings and for conducting combustion efficiency tests.