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If you want one to mount, Tel-Tru is about as good as it gets. For Remote Therms, many of us have MAVERICK 732/733 Dual Probe units that have one probe to measure Grill/Smoker Temp and one that measures Meat IT. There are others that escape me at the moment...JJ
I use $3 oven thermometers in my smoker. The thermometers mounted in the doors are for reference only. They don't tell me a thing about what the temp is in the middle of the smoke chamber. I can put oven therms exactly where I want and they are plenty accurate enough. I have a Thermapen for internal meat temps.