I was really excited to get this smoker and the first attempt I made produced wonderful results with a couple of chickens. Four cooks later and the temperature readings are all out of whack. I'm doing some ribs tonight and need 225° so that's what I set the temp for. My no-frills oven thermometer says we've got just under 190°. The MES meat probe shows 200°. I broke out my tried and true Sur Le Table digital thermometer probe and threw it in there. In order to achieve 225° on the proven Sur Le Table thermometer, I have to set the MES for 240°. The MES probe is reading 220° by the way and the digital readout on the MES screen claims the temp is 234° in there. Are they all this inaccurate? Or did I manage to get myself a lemon?