The modular flue gas probe contains a preliminary filter with a diameter of 14 mm, which protects the measuring instrument and its sensors from dusty flue gases. The probe also features a quick-change click system on the handle, enabling easy replacement of the probe shaft. The thermocouple NiCr-Ni, which is integrated in the probe shaft, enables temperature measurement up to 1000 °C. Flue gas path and temperature channel can be conveniently connected to the measuring instrument via a practical bayonet lock. Modular flue gas probe 700 mm with preliminary filter Ø 14 mm, including cone for attachment, thermocouple NiCr-Ni (TI) Tmax 1000 °C and NO 2 /SO 2 special hose 2.2 m. The modular flue gas probe with preliminary filter Ø 14 mm, 700 mm long probe shaft, thermocouple up to 1000 °C and quick-change click system (for quick probe shaft replacement).