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The 81305A from Giga-tronics is a Power Sensor with Frequency 10 MHz to 50 GHz, Power Range -50 to 0 dBm: +/- 0.05 dB/dB | 0 to +15 dBm: +/- 0. More details for 81305A can be seen below.
TVAC compliant USB and LAN Power Sensor
You can now find similar products from multiple companies on everything RF.