WSM 18.5" dome temp


 
The dome temp isn't as important as grate temp. Get a Thermapen, Maverick or Taylor. The price points on the Thermapens are a bit higher but man they just work. I've had 2 Mavericks and a Taylor and they work just fine for everyday use. My Thermapen instant read and grate probes are dead on each time though.
 
I have one of those long, non-automated therms that comes standard in most turkey frier kits. I've found that helps provide (cheap) clarity as to the dome versus fairly-close-to-grate temps, which I've found is about 25 degrees difference in the 200-250 range (and much greater difference when you're doing ultra-high heat for say chicken or turkey).
 
I take it you want to check temps @ the top vent?
If so, a turkey fryer therm like B Stone mentioned works, or any digital style therm with a probe and cable will suit what you need.

Tim
 

 

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