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.
This is the box assembled and wired up. The temperature probe is coiled up on the left. For anybody who cares (as if), that is a Pt100 RTD probe that is accurate to about +/-0.15 deg C. I think the whole turned out pretty good. Would have been worth a B (yet another digression).
This shows the cover on the fully assembled gizmo. It is plugged into the wall and the rice cooker is plugged into the box. The temperature probe is inserted in the hole of the rice cooker lid. This is where the lethal part comes in: mixing water and high voltage doesn't usually go very well. Usually.