Hewlett-Packard HP 5300B High Resolution Frequency Counter Measuring System USA

Victor VC3165 High Resolution Counter 0.01 Hz to 2.4 GHz

Victor VC3165 High Reolution Frequency Connter

HP 53131A Universal Frequency Counter/Timer 225 MHz / UNTESTED⚠️

GW GFC-801OF Frequency Counter 0 Hz - 120 MHz Good Will Instrument Co. Test

Para Dynamics Digital Frequency, Counter

HEATHKIT FREQUENCY COUNTER IM-4100 POWERS UP

BK B&K Precision Model 1823A 2.4GHz Universal Frequency Counter PARTS