I'm looking for an affordable, but more professional thermometer to measure flue gases in my stack. Unfortunately, my pipe goes up my chimney 6 inches above the stove, so I'll have to insert the thermometer pretty much right as gases leave stove. I'm assuming that you don't want temps above 350 for too much of the burn cycle if you are looking for high efficiency. And, you don't want them below 300 for too much of the burn cycle either, or else you are flirting with condensation. I hoping to get this thing in and still have a few weeks to use it before end of heating season.... Any recommendations appreciated. Thanks.