Additional Features: Excellent SWR for reducing mismatch uncertainty Accurate readings of Average Power Accurate calibration and traceability to NIST Precision type-N connector as standard The Agilent 8481D, High-Sensitivity Power Sensor, measures the average power over its entire -70 to -20 dBm dynamic range which gives you accurate readings even if your test signal is subjected to multi-tone environments, modulated carriers, or carriers with high harmonics. You also get extremely low SWR and it is traceable to the U.S. National Institute of Standards and Technology (NIST). The Agilent 11708A, 30 dB attenuator is supplied with Keysight Agilent HP 8480 series power sensors with the "D" suffix, for calibration with the power meter 0 dBm, 50 MHz reference.