I was reading Missyinohio's thread about her problems with the chimney and someone was talking about a thermometer on the stack. I was at TSC today and bought a Rutland magnetic themometer. But to get it up to the "proper range", even just barely in it, it is about to fry me out of the house. Is there a way to check the calibration on this thing? I have an oven thermometer that sits on the top of the stove right where the stack starts and when it reads 200 deg., the new thermometer on the stack reads 275, and that ain't hot enough (but I'm gettin' purty warm!) Any advice?