You can use Digi-Sense 08541-12 Type-T PVC Thermocouple Wire to construct your own probes. It comes as a 100' (30.5 m) spool, which makes it ideal for fabricating longer extension cables, as well. The PVC insulation is designed for temperatures up to 221°F (105°C).
|Temperature Range||-20 to 221°F (-28 to 105°C)|
|Error Limit||±1.5% reading from -330 to -85°F (-200 to -65°C); ±1.8°F (±1°C) from -85 to 270°F (-65 to 130°C); ±0.75% reading from 270 to 660°F (130 to 350°C)|
|Size||0.08 x 0.13" (2.03 x 3.3 mm)|
|Product Length||100' (30.5 m)|