Keysight (Agilent/HP) 8481H

The 8481H 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 -10 to +35 dBm with exceptional accuracy and stability. The 8481H has extremely low SWR. POWER SENSOR 10 MHz - 18 GHz, 100 µW - 3 W