USBcount50 50MHz USB pen-style Frequency/Period Counter, Synchrotech
USB Frequency Counter
USB frequency counter (PCB) · Issue #1 · swharden/AVR-projects · GitHub
USB Frequency Counter
53220A - Keysight Technologies - Frequency Counter, 1MHz to 350MHz, 12 Digits
Frequency Meter / Frequency Counter 10Hz-60MHz
53200 Series RF and Universal Frequency Counter / Timers | Keysight
USB-Powered Frequency Counter has wide RF frequency range.
Frequency counter and crystal tester kit: 1 Hz - 50 MHz | Elektor Magazine
Foxdelta FC4: PIC18F2550 USB 50/500MHZ Frequency Counter and RF Meter By Tony/I2TZK, Frank/k7sfn, Dinesh/VU2FD
Bg7tbl Fa-5 Freq Counter Usb Frequency Counter Acquisition Module 1hz To 6ghz 12.4g 26.5g Frequency Meter High Precision - Protective Sleeve - AliExpress
USB frequency counter
Integrated Frequency Counter & Power Meter - Mini-Circuits | Mouser
Amazon.com: FA-5 FREQ Counter USB Frequency Counter Acquisition Module Frequency Meter 26.5GHz : Industrial & Scientific