53220A - Keysight Technologies - Frequency Counter, 1MHz to 350MHz, 12 Digits
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Juntek Mhs5200a20mhz Dds Function Signal Generator Digital Control Dual-channel Frequency Counter/meter Arbitrary Waveform Pulse - Signal Generators - AliExpress
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Frequency Counter : Block Diagram, Circuit, Types and Its Applications
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2.7 Ghz Frequency Counter, Bench Type
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On Sale! Agilent 53150A Microwave Frequency Counter Model 53150-A
/i/84713/products/2015-04-01T11%3A13%3A03.859Z-frequency_counter_diy_kit_ver-3.jpg?1606306133 "Frequency Counter DIY Kit w/LCD 10Hz-250MHz from RH Electronics on Tindie")