So just a quick history about me,,, I am a commercial/industrial journeyman electrician that has a bit of experience in control and instrumentation... I have an old RT680 that I just installed the newest wifi controller in (firmware version 105) I was AMAZED how it locked in on temp,,, so amazed I was skeptical... So being OCD me I (like alot of us have done) placed my thermoworks smoke ambient probe right below the RTD and got the real scoop... temps @ 250 were 30 to 35 degrees off ... No problem right just use the offset adjustment and got it within 7° or so,,, that is until I started raising the temps,,, then the margin grew again... for awhile that was fine,,, I kept a note pad with the offset settings and entered them before every cook... But then I though why,,, why is the offset changing... So I looked around and researched what the other popular builders were using for controllers and RTD's ... The one thing I found is most other brand grills use a shorter probe,,, 4 inches instead of the 6 1/2 that RecTeq uses... So I bought a couple,,, one from Savannah and one from Amazon that said it's a replacement for I think it was for the big pit boss,,, They are both 4" and have the same ohm range as the one in my RT680 (which was replaced new with the controller ) What I found was very interesting in my testing... Temps were rock solid on the unit as before,,, what was different was in the offset,,, I adjusted it @ 250 to match as close as I could to my thermoworks unit and it held that setting all the way to the 400° where I was cooking,,, and the temp swings on the thermoworks probe where they were up to 25° difference are now around 10°... I will be doing more testing and will update the results if there is some interest... I am running the pit boss probe right now and like the results and will probably leave it in...