Drolet Probe Thermometer

I have a Condar probe thermometer . . . works pretty much on the same principle. Drill one hole with one sized drill bit . . . drill another hole in the same spot with a different sized drill bit. Magnet holds the whole she-bang together.

Some folks report good results with probe thermometers . . . others not so much. I've been pretty happy with my probe thermometer.

Like you . . . coupled with a IR thermometer I feel as though I have a pretty good handle on where the stove is in terms of temps . . . and where it is heading.

I have an SBI thermometer, which is the same as the Drolet (SBI makes Drolet anyhow, as I recall). As Jake said, the install is exactly as he said. It works just great with double-wall pipe. Granted, I'm running a Caddy furnace, but the stack temp at 2' from the furnace exit usually runs at about 450F, which is in the lower end of the 'safe range'.