Imperial 20-30 Unicouple®

1970 Series, 72" Thermocouple, 20-30 Mv Coaxial Thermocouple Threads = 11/32"-32. Imperial Oven Where Applicable Thermocouple Adaptor, N107, # 72-1003 Thermocouple Adaptor For Closed Circuit Test Of Thermocouples Using A Suitable Millivolt Test Meter. Analog Multi-Tester Meter N112, # 72-1008