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.