Mine is on a telescoping double wall pipe. It is no big deal to drill the hole, but I definitely would not put the probe in the overlapping area of the pipe. There are 4 layers in that area, with differeing rates of expansion, and I think that would turn out badly. I think I drilled a little smaller than the recommended hole. The probe is a little tight in the hole, which is good in my mind. Be sure to drill straight, because if you don't, the probe will hang a little crooked. Ask me how I know ... The biggest pain with the probe is that half the time I forget to remove it when I start to clean the pipe. Never broke anything though. Mine has three color bands - yellow (too cold), orange (good burn zone), and red (overfire). On startup, I leave the door ajar until it gets into the orange, then push the damper halfway in when it is deep into the orange, or touching the red (depending on how hot I want it). Works great for me.
I have one of those magnetic thermometers, that's on my single wall pipe. More of a novelty, IMO. Having a front door of glass, let's me know how well the fire is going. The stove top cat probe is sufficient.
This is great information. I feel dumb for not thinking of this right away but yes if I keep the gauge in the lower section it shouldn’t be an issue ...
You must use a probe meter for double wall and you must use a surface temp meter for single wall. So all of the probe meters you see should be installed into double wall. I've done it a few times and the drilling is easy. A single hole all the way through and then chuck up a larger bit to upsize the outer hole. Bit sizes are specified and be sure to drill straight for aesthetics. I too have run brushes and the sooteater past my probe meter on accident without hurting it. The cat probe meter is not measuring flue temps so is not apples to apples. The flue can be way too hot before the cat meter budges off of low! Been there too.
The Auber thermocouple probe works fine on single wall, with the added security of a built in high temp alarm, I wouldn't be without it. I don't use surface temp of the stove anymore, just the flue temp and a visual of the fire through the glass. Thermometer for Stove Pipe,Chimney,Outdoor Wood Boiler,w/ Alarm Thermometer for monitoring temperature on stove, chimney, or outdoor wood boiler [AT200CHIM] - $57.99 : Auber Instruments, Inc., Temperature control solutions for home and industry High Temperature Alarm?