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  1. Arduino Frequency Counter | Arduino Projects - Simple Circuit

  2. 53200 Series RF and Universal Frequency Counter / Timers

  3. The RF Engineer's Essential Guide to Frequency Counters

  4. Build a Frequency Counter with Arduino Easily - Electronics Hub

  5. Counter/Frequency Modules - Advantech

  6. Frequency Counters - NI - National Instruments

  7. Characterizing A Cheap 500MHz Counter Module - Hackaday