Check the listing for details. TPI 712 Combustion Efficiency Analyzer with Flue Probe. Condition: Used, Made in United States. Listed at 400.00 USD. The TPI 712 Combustion Efficiency Analyzer with Flue Probe is a high-quality instrument designed to accurately measure the combustion efficiency of gases. With the brand's reputation for reliability and precision, this analyzer is a valuable tool for professionals in various industries. Its detailed analysis allows users to optimize their processes and ensure optimal performance, making it a must-have for those looking to improve efficiency and reduce emissions. The flue probe ensures easy and convenient measurements, making it a practical choice for testing and measurement needs.