K-type Thermocouple wire for making thermocouple or extension wire Chromel / Alumel type K thermocouple wire with Standard Accuracy (whichever is greater): +/- 2.2C or +/-.75% Stranded thermocouple wire, AWG 24 (0.51 mm), 7 strands x 0.2 mm ANSI color coded PVC vinyl insulation, red = -, yellow = + Sold in 10 yd rolls, 1 unit = 10 yard or 30 ft, order 2 units and you receive 2 x 10 yd wire