Buy a solid High Temperature K-type thermocouple wire for extension wire or thermocouple
K type thermocouple extension wire, multistranded [KX22GA] - $1.59 : Auber Instruments, Inc., Temperature control solutions for home and industry
Thermocouple Wire / Thermocouple Cable / Thermocouple Extension Wire Type B R S K N E J T - China Thermocouple Wire, Type K Thermocouple Wire | Made-in-China.com
Thermocouple Cable and Wire | Leading Supplier | Pyrosales
K-Type Thermocouple Wire AWG 24 Solid w. High Temperature Fiberglass Insulation up to 700 Degree C or 1300 F - 10 Yard roll: Amazon.com: Industrial & Scientific