Voltage controller for manual element power/heat control.
The bits:[list]
[*]25A Resistance SSR
[*]Aluminium heat sink
[*]15A cables (one ending in a C19 plug)
[*]500k pot + knob & 0-100% label
[*]Volt meter
[*]DPST LED switch
[*]Plastic jiffy box
[*]Misc crimps/screws/etc.
[/list]
Just add power tools...