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The 57006 from Boonton is a Power Sensor with Frequency 0.5 to 6 GHz, Power Range -60 to +20 dBm, Peak Power Range -50 to +20 dBm, CW Power Range -60 to +20 dBm, Rise time <7 ns. More details for 57006 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.