The Keysight 8481D is a high-precision diode power sensor designed for accurate average power measurements across 10 MHz to 18 GHz, with a dynamic range from -70 dBm to -20 dBm. Featuring excellent SWR for reduced mismatch uncertainty and full NIST-traceable calibration, it is compatible with a wide range of Keysight power meters including EPM, EPM-P, and P-series.