There are many types of devices used in Stack emissions based on the objective. Most commonly used devices are: 1) Iso-Kinetic Sampling: Manual and Automatic 2) Pollutant Specific: PM 2.5 and PM10, Sulfuric acid, Dioxin Furan, Halogens and Halides etc. measurement instrument 3) Specific Gas Sampling Instruments: NOx, SO2, VOC, Flue Gas Analyzers, Electrochemical Sensor based analyzers, etc. 4) Metal Emission Sampling Instruments 5) Specific Parameters: Pressure, Flow, Temperature, Velocity, Relative Humidity measurement instruments