Keysight Technologies (formerly Agilent) E9304A9kHz-6.GHz power sensor.
Power range -60dBm to +20dBm (1 nW to 100 mW);
This sensor is ideal for very low frequency (VLF) power measurements.
Type N connector.
Option H25 extends bandwidth (9kHz to 18GHz) and raises power range
(-50dBm to +30dBm)
Power sensor is designed for use with power meters:
KT-E4418A, KT-E4418B, KT-E4419A, or KT-E4419B
KT-E4416A or KT-E4417A
KT-N1911A or KT-N1912A (requires adapter cable KT-N1917A)