Pair of RepRap Thermistors #1 EPCOS B57560G104F, Prusa Mendel
Don't be fooled by the cheaper thermistors. You will need to calculate new thermistor tables to put in your firmware. Make sure you are getting a thermistor already in the firmware so you do not waste your time trying to calculate the table, then hope it works correctly.
Plenty of info for this thermistor is on the RepRap.org pages.
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