RTD and Thermistor Extension Wire Silver plated copper wire insulated with Teflon, PFA RTD wire for Extending RTD and Thermistor Signal Leads High Temperature Glass, PFA and Teflon Insulation Wire Available with 2, 3 and 4 Conductors... AWG 20 solid, 24 or 26 stranded Spool Lengths in meters RTD and thermistor extension wire