Just ordered a model 2 for my nephew and fiancé as an engagement/housewarming gift. Now I'm thinking about one for myself. I'm a bit confused on the model 2D vs. 2D wifi. It looks like the 2D comes with a single meat probe, and I assume an internal probe to regulate the temperature. The wifi model shows what appear to be two meat probes in a photo, and also notes a protected interior probe for temp control. Is this correct, or is one of those probes in the photo actually for regulating the temp?