Testo India Pvt. Ltd. Supplies Flue Gas Analyzer with Oxygen Sensor .Testo India Pvt. Ltd. Is the manufacturer of portable instrumentation. Flue Gas Analyzer with Oxygen Sensor is used for all emission monitoring applications of industrial furnaces such as processing and power plants, by service technicians for burner/furnace manufacturers, for plant construction as well as for stationary motors. Even spot measurements or up to 2 hours are possible.