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You may be able to use a thermal snap disc, but I don't know if you can get that close of a "make" to "break" range. Try www.ccithermal.com or **broken link removed**
www.omega.com is a good site for sensing devices. Here is an adjustable temperature switch: www.omega.com/ppt/pptsc.asp?ref=TSW&Nav=temp11
It's kind of expensive, and about the size of a pencil, but it is good quality and precision, I can assure you. They come in different ranges, so don't mistake the range value discription for a reflection of precision, rather, this is the adjustable range that the setpoint can be adjusted.
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