8485D - Keysight (Agilent) Power Meter

Agilent HP 8485D 50MHz-26.5GHz Diode Power Sensor

Features:
Excellent SWR for reducing mismatch uncertainty
Accurate calibration and traceability to US National Institute of Standards and Technology (NIST)
Compatible with EPM (new N1913A/ 14A, E4418B/ 19B), EPM-P (E4416A/ 17A) and P-series (N1911A/ 12A) power meters, plus the E1416A VXI and discontinued 70100A and 43X power meter
Accurate average power measurements over -70 to -20 dBm
Frequency range 50 MHz to 26.5 GHz
Diode power sensing element
The Keysight 11708A 30 dB attenuator is supplied with 8480 series power sensors with the "D" suffix, for calibration with the power meter 0 dBm, 50 MHz reference.