I've been using my Webber smoker for about a year and a half. On my latest smoke I've noticed a 30 degree temp difference between the probe inserted at the side port and the one at the top rack. The gauge in the lid reads close to the temp at the side port. The temp on the top rack is 30 degrees warmer. I've moved the side port probe to the top rack and it agrees with the probe that is next to it.
I've never used multiple probes before so I'm wondering where do I get an accurate temp reading for whats going on inside the smoker. I know the gauge on the lid isn't as accurate as the other probe but can it be 30 degrees off?
Everything I've smoked has come out fine but now I'm not sure on what temps I've been smoking at in the past.
Currently the upper rack probe reads 280 the side port probe reads 150 and the lid gauge reads 145.
The pork butt temp reads 192, 12.5 hours in. Its a 10 pound butt.
Any thoughts or comments?