- Hirst Magnetic Instruments Ltd.
- Manufactures a range of easy to operate magnetising systems, including magnetisers, demagnetisers, magnet characterisation, instruments, gaussmeters and fluxmeters.
- Northern Technology & Testing
- Independent lab services providing analysis of insulating fluids.
- TJ/H2b Analytical Services, Inc.
- Laboratory and consulting firm that specializes in diagnostic testing of oil, gas and other insulating materials used in transformers, power circuit breakers and load tap-changers.
- Vasavi Electronics
- Specializes in automatic test equipment for transformers, automatic test equipment for relays, test and measuring instruments for transformers, coils, relays, capacitors and cables.
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