Tektronix DC504A Counter / Timer Module #1

Tektronix DC504 Counter Timer Module #1

Hewlett Packard HP Agilent 5316B Universal Counter Benchtop + Option 001 & 003

Tektronix DC504A Frequency Counter Plug In

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

2.7GHz/100MHz RF Signal Frequency Counter 0.96inch OLED Display Frequency Module

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

Tektronix PG505 Pulse Generator Module #1