With the addition of a few pots and a box this could make a really cheap dew heater controller. It's certainly cheaper than making it yourself...
http://cgi.ebay.co.uk/4-Way-Mosfet-Heater-Telescope-Small-DC-Heater-/400177646608?pt=UK_Telescopes&hash=item5d2c724c10 (http://cgi.ebay.co.uk/4-Way-Mosfet-Heater-Telescope-Small-DC-Heater-/400177646608?pt=UK_Telescopes&hash=item5d2c724c10)
There aren't many left.
Robert
bought one what is it
It's like a 4-way version of this http://www.maplin.co.uk/Module.aspx?ModuleNo=30310 (http://www.maplin.co.uk/Module.aspx?ModuleNo=30310)
I knew that :-) just joking.