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The 478A from Keysight Technologies is a Power Sensor with Frequency 10 MHz to 10 GHz, Power Range -30 dBm (1 uW) to +10 dBm (10 mW). More details for 478A 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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