This is the box with the components in place but not wired up yet. There is something called a PID controller top right, and another thing called an SSR bottom middle. The tin box is something I built back around Grade 8 in Industrial Arts. Mr Drescher gave me a B. He always gave me (and everybody else) a B, even for the two story, 16 compartment birdhouse I built. But I digress once again.