Refrasil Hi-Temp Survey Thermocouple Wire | Refrasil Hi-Temp Survey Thermocouple Wire (good for Vacuum Furnace use!) P/N: 2100-HgHg-20-KK, Type K Special Limits 20 Awg with Certs from 0-2000 P/N: 2100-HgHg-20-NN, Type N Special Limits 20 Awg with Certs from 0-2000