The Agilent 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.
Excellent SWR for reducing mismatch uncertainty
Accurate calibration and traceability to US National Institute of Standards and Technology (NIST)
Compatible with EPM, EPM-P and P-series power meters, plus the E1416A VXI and discontinued 70100A and 43X power meter
Accurate average power measurements over -70 to -20 dBm