ORIGINAL: Tired Old Man
A Venom temp monitor, available at a lot of hobby shops and, unfortunately, Tower is a reasonable and inexpensive way to go. Not 100% accurate but does provide a relatively constant basis for reference.
Would one of these work?
http://www.aliexpress.com/fm-store/5...-dia-14mm.html
But what other electronics is needed? An RTD is a variable resister? Would a good digital multimeter be all that is needed, of course after calibration? Thanks.