described devices allow the greatest amounts of gases entering the probe body to enter through the most deeply immersed distal end of the probe adjacent to the measuring instruments temperature and oxygen which both of course have components that are necessarily not gas permeable the gases are then able to flow between the probe body and the larger tube 18 as well as between the tubes 18 and 20 into the area of slots 22 in the embodiment of fig1 gases can also flow through a ceramic fiber filter 84 and around the plastic electrical connector 89 connector 89 is loosely secured by small projections often referred to as u201c nubs u201d in the interior of tube 32 in the embodiment of fig1 gases also exit through metal tube 32 through filter 84 and around plastic electrical connector 89 into the space between tube 20 and the supporting lance not shown and into the atmosphere in the embodiment of fig2 and 3 a similar venting path is also available in the embodiments such as fig1 and fig2 and 3 that have two paperboard tubes 18 and 20 gases also vent from between the two tubes out through intermittent openings in adhesive of junction 31 in the case of fig2 and 3 the outer diameter of mold 30 is less than the inner diameter of tube 18 in order to allow free venting in the space between them as well as through the gas permeable probe bodies 12 and 30 the probes of this invention 10 40 and 70 are formed by assembling all of the illustrated components in a.