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The GT-8888A from Giga-tronics is a Power Sensor with Frequency 10 MHz to 10 GHz, Power Range -60 to +20 dBm. More details for GT-8888A can be seen below.
TVAC compliant USB and LAN Power Sensor
10 MHz to 8 GHz Three-path Diode Power Sensors
You can now find similar products from multiple companies on everything RF.