Need to warm up my tomatos

[Mentat]

...I was looking at some temperature control like Amazon.com: R-Zilla Controller Temperature, 500-watt: Pet Supplies this. How on earth does it maintain the temperature on another device though?...

That is an automatic thermostat rated for up to 500 watts; but it only has one probe and can be used with one enclosure only.

[Baloo]

Thanks, I'm seeing the other thread now and I'll try those other products.