Tektronix DC 509 135MHz Universal Counter Timer TM 500 TM500 Plug-In Test Module

Optoelectronics FC-50 Frequency Counter Tested Working 8 digits ! Ships Fast !

HP / Agilent 53131A 225 MHz Universal Frequency Counter/Timer Tested

Vintage Pride Electronics CB FC-12 frequency counter No Power Supply Not Tested

Simpson 710 frequency counter with power adapter 12751 and leather case 00747

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

BALLANTINE 5500A DIGITAL FREQUENCY COUNTER 70 MHZ NIXIE TUBE | Power Tested Read

Siltronix Frequency Counter FD 1011 40 Channel Tested & Works