Seitron Americas S500-1 Combustion Analyzer with O2, CO, CO2, Combustion Efficiency. Maximize Combustion Efficiency of Residential and Light-Commercial Boilers, Water Heaters and Furnaces.

Combustible Gas Leak Detector with DIGITAL READOUT. Measures in PPM, % LEL, or % vol. 7899 E-Instruments Gas Sniffer QUANTIFIES combustible gas leaks with large, easy-view LCD & 11-inch flex sensor.