K-type Thermocouple Extension Wire - 3 ft long (= 1 yard, 91 cm) Chromel / Alumel K-Type thermocouple wire with Standard Accuracy, Wire diameter AWG 24 (0.51 mm) Type K ANSI color coded PVC insulation, red = -, yellow = +, outside yellow Miniature K-type connectors, spade type, contacts made from compensation metals chromel and alumel This Type K extension wire can transmit the temperature signal from -200 to + 2500 deg F, but the wire needs to be kept below 105 deg F