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Agilent / HP 4277A LCZ Meter, 10 kHz-1 MHz Test Frequency, Refurbished - at the Test Equipment Depot
HP 500B Frequency Meter. | Richard Sears, Vintage Electronics
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The HP 536A Frequency Meter https://www.microwaves101.com/encyclopedias/ frequency-meters
Frequency Wave Meter
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Hewlett Packard 5383A Compact Frequency Counter 10Hz-520Mhz - Counters and Timers - BMI Surplus
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HP HEWLETT PACKARD 5381A - 80 MHz Frequency Counter | eBay
