100k thermistor with 1m cable (. In includes a short PTFE Tube (0.6 x 1 mm) to protect the thermistor. ).
2 x B3950 100k Ohm NTC Thermistor 1% Temperature Sensor for 3D Printer Reprap UK
100K Ohm NTC Thermistor with Connector Attached - 3D Printer Prusa RepRap Mendel
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NTC Thermistor Temperature Sensor Probe 5K 10K 15K 20K 50K 100K ohm 50cm/1m/2m