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The 80621A from Giga-tronics is a Power Sensor with Frequency 10 MHz to 18 GHz, Power Range -47 dBm to +37 dBm, Max Input Power +37 dBm (5 W). More details for 80621A can be seen below.
TVAC compliant USB and LAN Power Sensor
You can now find similar products from multiple companies on everything RF.