HP/Keysight Agilent 53181A opt:030 Universal Frequency Counter 3GHZ,10 digits/s

Agilent 53181A 1.5 GHz Frequency Counter

HP Hewlett Packard 5245L Electronic Counter + 5253B Frequency Converter

HP 53131A Universal Counter 225MHz Frquency Counter Tested Working Clean Display

1PC Used HP Keysight Agilent 53181A Universal Frequency Counter 225MHz

Agilent 53181A 225mhz Universal Frequency Counter

HP / Agilent 53131A 225 MHz Universal Frequency Counter/Timer R3536

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