The 8487D diode power sensor measures average power over the frequency range 50 MHz to 50 GHz and power range -70 to -20 dBm (50 dB dynamic range).
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.
Agilent / Keysight 8487D