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The 8481D from Keysight Technologies is a Power Sensor with Frequency 10 MHz to 18 GHz, Power Range -70 to -20 dBm (100 pW to 10 uW). More details for 8481D can be seen below.
TVAC compliant USB and LAN Power Sensor
10 MHz to 8 GHz Three-path Diode Power Sensors
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