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The GT-8551A from Giga-tronics is a Power Sensor with Frequency 100 MHz to 8 GHz (operational to 10 GHz), Power Range -60 to +20 dBm. More details for GT-8551A 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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