BK PRECISION 1803 100 MHz Frequency Counter

ProTek B-2000A Universal Frequency Counter, Up To 2 GHz , Tested

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Radio Shack 22-306 LCD RF Frequency Counter 1 - 1300 Mhz (1.3Ghz) Works

B&K Precision 1801 Frequency Counter Test Equipment, MHz Frequency Range

Vintage DSI Model 3550 Frequency Counter 50 Hz-550MHz

Vintage Frequency Counter Model Regency Model EC-175 Frequency Counter (175Mhz)

Hewlett-Packard HP 5302A 50 MHz Universal Counter Frequency Counter