BK Precision Dynascan 1855 1.2GHz Frequency Counter,

Mercer Electronics Model 9800 Frequency 100 MHz Multifunction Counter

BK Precision 100MHz Frequency Counter 1803A

Fluke 1900A Multi-Counter Frequency Counter

Sabtronics 8100 Frequency Counter Digital Bench Test Instrument Powers On

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

HP AGILENT 5314A UNIVERSAL COUNTER / Hewlett Packard / Made In USA / READ DESC

Optoelectronics Micro Handi-Counter 3000A 10hz- 3ghz Dual Input