| Alff Engineering: PDC-ANALYSER equipment for on-site evaluation of the properties of mixed insulation as found in high voltage transformers. |
| Ameesco: High voltage test equipment services and consulting. Specializing in the installation, commissioning and maintenance of all types of high voltage test equipment. |
| Hachmann-IT: Manufacturing of test-equipment for high voltage installations. From Germany. |
| High Voltage Equipment Diagnostics Inc.: Specializes in HV diagnostics and PM's for power utilities and sub-stations. |
| High voltage Probes (Tektronics): For O'scopes, from Beta Lambda Instruments. |
| Hipotronics: Manufacturer of high voltage test and automatic test sets systems for users and manufacturers of power apparatus. |
| HV and EMC Test Equipment: High voltage test equipment and EMC test equipment for the power utility, power apparatus, and electronic equipment industries. |
| Zimmer Electronic Systems: Manufactures high precision power analyzer and meters. |
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