What are the key feastures of the flue gas probes?

The Firebird TGD flue gas probe has a screw-off coaxial probe tube, separate gas/pressure paths, a stainless steel protective tube and a moulded handle. The Eco TGD flue gas probe also has a moulded handle and impresses with its fast response time. In addition, a slotted hole is visible on the measuring tip. The Sigma flue gas probe, on the other hand, differs in particular in its heated handle, optional screw-off probe tube and R6 soot filter holder.