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The 57518 from Boonton is a Power Sensor with Frequency 0.1 to 18 GHz, Power Range -50 to +20 dBm, Peak Power Range -40 to +20 dBm, CW Power Range -50 to +20 dBm, Rise time <100 ns. More details for 57518 can be seen below.
TVAC compliant USB and LAN Power Sensor
You can now find similar products from multiple companies on everything RF.