... The conditions of measurement determine the type of thermocouple wire and insulation to be used. Temperature range, environment ... data of thermocouple extension wire and thermocouple compensating wire as following: 1. Wire grade ( Thermocouple wire or extension wire) 2. Calibration ( ... standard) 5. Wire gauge size (16AWG, 18AWG, 20AWG, ...) 6. Wire shape ( Round, Flat or Twisted) 7. Wire type ( Solid ...