Keysight Technologies (formerly Agilent) 8481B10MHz to 18GHz 25W power sensor.
SWR, 1.28 at 12.4 to 18GHz.
Power Range 0 to +44 dBm (1 mW to 25 W)
High power sensor is designed for use with power meters:
KT-435B, KT-436A, KT-437B, KT-438A
KT-E4418A, KT-E4418B, KT-E4419A, or KT-E4419B
KT-E4416A or KT-E4417A
See also KT-E9300B or KT-N8481B/100