Union Carbide Electronics Vintage Korad Laser Systems K-J Calorimeter

B&K Precision 80 MHZ Frequency Counter 1805 (Tested & Working!)

BK Precision 1856D 3.5 GHz Multifunction Counter (Frequency, Period, Totalize)

BK Precision Dynascan Corporation Model 1805 8 Digit Frequency Counter 80 MHz

HP 537A Frequency Meter, 3.7-12.3 GHz Untested

HeNe Laser Kits - Basic, Zeeman, Stabilized with or without Arduino Controller

B&K Precision 80 MHZ Frequency Counter 1805 Used

HeNe Laser Tubes - Many Types - Teaching, Research, Modes, Stabilized, Zeeman