Hewlett Packard HP 5326A Timer / Counter Powers Up Untested

HP 5350B Microwave Frequency Counter

Tektronix DC 5010 Programmable Universal Counter Timer

Hewlett-Packard (HP) Model 5245L Electronic Counter w/ 5253B Frequency Converter

Vintage Hewlett-Packard HP Model 5253B Electronic Counter 5245L Mount UNTESTED

Systron Donner 6054D Frequency Counter + Opt 18 (tested up to 3GHz)

HP Agilent Keysight 53132A Universal Frequency Counter 12 DIGIT

HP Hewlett Packard 53132A Universal Frequency Counter