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uxcell Fiber Optical Power Meter with Light Source SC FC Connector Optic Test Equipment for CCTV Communication Engineering -70 to 10 dBm: Amazon.com: Industrial & Scientific
GitHub - DerekWarter/dBm-to-meters: Very short script to convert 2.4 GHz WiFi signal strength reading (in decibels per milliwatt) to distance from hotspot in meters.
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Amazon.com: RF Power Meter, 1-600MHz -60~-5 dBm Settable Power Attenuation Digital Display Of Signal Strength, RF Logarithmic Detector Amplifiers : Industrial & Scientific
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