You need to read up on tstats. Not knowing what one is tells me you have research that needs to be done.
A thermometer measure the temp.
A thermostat regulates the power delivered to your heat source to control it. Tstat for short.
I like Herpstats.
http://www.spyderrobotics.com/index....=index&cPath=1
Buy cheap and you'll get cheap. If you think a tstat is expensive you don't want to see the bill from a title get to treat a burn from a cheap tstat.
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