This smart little demo is designed to be immersed in 2-3" of water, each aluminum "leg" being immersed in one of the included plastic cups. Immerse the generator in cups of water of equal temperature, and nothing happens. Immerse the generator in cups of water with a substantial temperature gradient (hot or cold), and the fan will begin to spin after a few minutes. Has 4mm DC input/output terminals and switch to redirect electricity to/from these terminals. The output from these terminals can be hooked up to a meter for measurement, allowing the user to monitor temperature gradient and output data.

A DC power supply (up to 6V) can be routed through the 4mm terminals, demonstrating heating on one side and cooling on the other side of the thermocouple.