The TÜV-tested modular flue gas probe with 300 mm long probe shaft features a quick-change click system on the handle, which enables easy replacement of the probe shaft. The thermocouple NiCr-Ni, which is integrated in the probe shaft, enables temperature measurement up to 500 °C. Flue gas path and temperature channel can be conveniently connected to the measuring instrument via a practical bayonet lock. In addition, a dirt filter protects the instrument and its sensors from contamination.