Magna-Power 

DC Power Supplies:  2kW to 900kW+, Voltage Ranges from 0-5Vdc to 0-4000Vdc

DC Electronic Loads: 1.25kW to 120kW+, upto 1000Vdc

Regatron 

Bidirectional Source & Sink high power DC power sources, Regenerative high power DC loads, Full 4-Quadrant AC Grid simulators and Photovoltaic / Solar array power sources

Preen

Programmable AC Power Supplies, Motor Generator Replacements,

Regenerative AC Power Sources, Regenerative AC Loads

Keithley 

Digital Multimeters, Source Measure Units, DC Power Supplies, Semiconductor Test, Switching Systems, Specialty Instruments

 BK Precision

Power Supplies, Electronic Loads, Function Generators, Multimeters, Oscilloscopes, Spectrum Analyzers, RF Test Instruments, Frequency Counters Electrical Testers, Component Testers/Logic Probes, Video & Cable Testers​