The modular flue gas probe with 180 mm long probe shaft features a quick-change click system on the handle, which enables really easy replacement of the probe shaft. The thermocouple NiCr-Ni, which is integrated into 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.