The Wohler 4189 40 in. (1000 mm) Flue Gas Probe with Filter Holder is designed for use with the A 550 Industrial Flue Gas Emissions Analyzer (model 5996). The probe takes emission measurements, even with heavy dust loads. The included sinter filter removes dust (> 20 ym) from the sample gas to protect the analyzer against heavy dust loads. The long length of the probe allows it to perform measurements in difficult to reach locations.