I just got a few from tel tru. I ended up with a 3 inch dial and I think the range went 50-500 or so. Went with 2.5 inch stem for the smoker and 4 inch for the warmer chamber. Opted for the black dial....gonna look good on a black smoker and not stick out a much as a white face dial.
These mount on a 7/8 inch hole and have a pretty stout probe.
No adjustment but I figure they are reference anyway as I got some probes for actual grate temps. Also, not cheap but they are made in the USA so that is a plus for me. As a side note, I paid a few dollars more than a cheaper website, but I bought directly from tel tru. The cheaper site just looked a bit odd so I figured a few dollars to avoid a counterfeit was worth it.