The 8481B thermocouple power sensor is designed for use with the EPM series, EPM-P series, 70100A, E1416A and the 435A/B, 436A, 437A/B, and 438A power meters. It operates from 10 MHz to 18 GHz at levels from 0 to +44 dBm with exceptional accuracy and stability. The 8481B has extremely low SWR and is traceable to the U.S. National Institute of Standards and Technology (NIST). A detachable 30 dB precision power attenuator permits calibration from compatible power meters.