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In any event, all you need is the sensor itself which is an NTC thermistor. Units such as the Fenwal #192-302LET-A01 or Thermometrics #EC95F302W are more durable and accurate than the original spec. The Thermometrics unit, for example, lists for $3.75 and is available from electronics suppliers such as Newark and Allied.
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This is from a 5 year-old post in the Tech Help forum. there's a lot more good information in the archives of that forum if you want to pursue it.