Has anyone tried one of those infrared gun-type, point and shoot with the laser, thermometers to measure smoker temps? I'm looking for something to give me accurate smoker temps for my GOSM. I don't trust the one on the door. I see Harbor Freight Tools has one of the infrared guns for $40. I've heard they are very accurate, but was wondering how they would work on a smoker. Maybe shoot the laser into the top vent. Any thoughts?