<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by James Harvey:
Kevin - What are these grate variables accepting that probes placed too close to the outside perimeter will read higher due to the airflow coming from around the bowl and probes too close to cold meat will show low until equilibrium? Depending on the answer, why not run all wires under the lid? </div></BLOCKQUOTE>Those are the key variables - each totally screwing up whatever reading you're getting - not to mention that how you fire your cooker, how much meat you have loaded in, among other issues, cooker will have their affects.
So why run any under the lid unless you absolutely have to monitor meat temp? (I see no point in monitoring brisket or butt temps. I will monitor something like bacon, that needs to just hit a particular temp before it's pulled.) The vent offers a consistent reading as that is where the draft exits. That's all one needs. All this fussing about trying to get some handle on an accurate grate temp, or the differences between one grate and the other or the grate and the lid is useless. More cooks spend inordinate amounta of time - and money - trying to get some sort of handle on control of these temps and temp differences.
None of this matters nor is worth the time it takes to even think about it. Cooktemps - real or perceived - are not all that important. Having some sense of temps can be - and for this, imco, the vent is a far better place to temp.