Reliable and Accurate: Testo 327-1 Multi-Purpose Flue Gas Analyser Advanced Kit This Winter we are offering a FREE Premium Magnetic Work Light with any testo 327 Flue Gas Analyser Kit. The Testo 327-1 Gas Analyser Advanced Kit is the ultimate choice for plumbers seeking reliable and accurate flue gas analysis. This versatile instrument measures combustion efficiency, temperature (C), oxygen (O2), carbon dioxide (CO2), carbon monoxide (CO), and flue draught, making it suitable for use with natural gas, heavy and light oil, kerosene, LPG, and wood pellets. Key Features: Comprehensive Measurements