I have a ME pro, model number 20070612. I have numerous other thermometers but my smoking gadget is a char griller, I float one on the rack my meat is on and another in the meat itself. This has a second wireless set I carry around the house to view BBQ and meat temps. I've never relied on grill temps but can't believe how off the 2 are. Right now my thermometer says 234, while the built in one says 170. Makes me 2nd guess my store bought one. What gives?