I've had my ET-73 for two weeks so it's pretty new. The probes are different - the smoker probe has a blunt end, it's shorter than the meat probe and easily slides into the grate clip. I pinch the grate clip so it 'wedges' itself between two bars of the grate. When compressed, the clip does not bind on the probe but it does hold it in place. I keep the 'smoker probe' as close to the smoker session star as possible. Temps do vary in smokers, especially my ECB.