What kind of stove top thermometer does every one here like? All the magnetic stack thermometers I've tried are badly inaccurate. In fact if you stick 3 of any of the models I've tried to the same surface, you'll get 3 wildly different readings, especially after a few heating and coling cycles. I kinda need an accurate one to help me figure out why my Quad 4300 is putting out less than half the heat for quantity of wood burned than other stoves I've had in the same place.